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Conference 11895

Optical Design and Testing XI

In person: 10 - 11 October 2021
On demand now
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  • Opening Ceremony and Plenary Session I
  • 1: Fabrication and Testing
  • Plenary Session II
  • 2: Advanced Optical Systems
  • 3: Novel Imaging/Lighting Techniques
  • 4: Computational Imaging
  • Poster Session
  • 5: Optical System Designs I
  • 6: Optical System Designs II
2021-10-18T19:39:58-07:00
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UPCOMING LIVE EVENTS:
Opening Ceremony and Plenary Session I
In person / Livestream: 10 October 2021 • 09:00 - 12:00 China Standard Time
9:00: Opening Ceremony
9:20: Awards and Recognition

11900-501
Author(s): Rebecca R. Richards-Kortum, Director, Rice 360 Institute for Global Health Technologies (United States), Rice Univ. (United States)
In person / Livestream: 10 October 2021 • 09:30 - 10:10 China Standard Time
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This talk will examine the challenges of designing and translating new low-cost optical technologies to improve global health equity, drawing from examples to improve newborn survival in African hospitals, to improve early detection of cervical cancer for women in Texas and Latin America, and to improve point-of-care diagnosis of COVID-19. The talk will summarize lessons learned to increase the diversity of innovation teams, and to increase the impact and sustainability of the resulting innovations.
Tea/Coffee Break 10:10 - 10:40
11890-502
Author(s): Wentao Wang, State Key Lab. of High Field Laser Physics (China), CAS Ctr. for Excellence in Ultra-intense Laser Science (China), Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences (China)
In person: 10 October 2021 • 10:40 - 11:20 China Standard Time
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X-ray free-electron lasers can generate intense and coherent radiation at wavelengths down to the sub-ångström region and have become indispensable tools for applications in structural biology and chemistry, among other disciplines. Several X-ray free-electron laser facilities are in operation; however, their requirement for large, high-cost, state-of-the-art radio-frequency accelerators has led to great interest in the development of compact and economical accelerators. Laser-wakefield accelerators can sustain accelerating gradients more than three orders of magnitude higher than those of radio-frequency accelerators, and are regarded as an attractive option for driving compact X-ray free-electron lasers. However, the realization of such devices remains a challenge owing to the relatively poor quality of electron beams that are based on a laser-wakefield accelerator. After ten years of efforts, we present an experimental demonstration of undulator radiation amplification in the exponential-gain regime by using electron beams based on a laser-wakefield accelerator.
11893-503
Author(s): Rui Zhu, Peking Univ. (China)
In person: 10 October 2021 • 11:20 - 12:00 China Standard Time
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Perovskite solar cells have attracted tremendous attention in recent years due to the high device performance and the superior optoelectronic properties of perovskite materials. In this talk, I will give an introduction about the advances of perovskite solar cells. Then, I will present our efforts on improving the device performance and understanding the device physics of perovskite solar cells. In addition, I will also discuss the advantages of perovskite solar cells for space aircraft application. We have some preliminary efforts of sending the perovskite solar cells into near space. I will share our view about the exciting possibilities for perovskite solar cell technology.
Break
Lunch Break 12:00 - 13:30
Session 1: Fabrication and Testing
In person: 10 October 2021 • 13:30 - 15:20 China Standard Time
Session Chair: Yongtian Wang, Beijing Institute of Technology (China)
11895-1
Author(s): Fengzhou Fang, Tianjin Univ. (China)
In person: 10 October 2021 • 13:30 - 14:00 China Standard Time
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Freeform optics find wide applications in various fields, such as virtual reality, augmented reality, high precision imaging and illumination systems. While it provides better optical performance, systems with freeform optics can be more compact in volume, lighter in weight, less in elements number and more in design freedom. This presentation mainly focuses on the manufacturing and measurement methods for complex shapes or structures. Typical applications developed in the presenter’s laboratory together with industrial partners will be discussed. The research perspectives and the current application status of freeform optics will be outlined.
11895-2
Author(s): Xiangchao Zhang, Min Xu, Fudan Univ. (China)
In person: 10 October 2021 • 14:00 - 14:30 China Standard Time
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Recently the measurement of freeform optical elements has attracted intensive attention. Deflectometry is a powerful measuring technique, because its measurement accuracy is comparable with conventional interferometry, but with higher flexibility, stability and cost efficiency. The main error sources in the deflectometric measurement are analyzed systematically first. The SCOTS method is applied to address the ‘height ambiguity’ problem. An accurate self-calibration method is proposed. The workpiece is positioned with an extra-detection-free measuring strategy. The blurring effect caused by the defocus and aberrations of the off-axis catadioptric imaging system can severely degrade the phases solved from the blurred images. In order to correct the phase errors, the space-variant point spread functions are modelled, and the phase bias is estimated by forward convolution between the captured images and the point spread function models. Experimental results demonstrate that the measuremen
11895-3
Author(s): Zhendong Wu, Daodang Wang, Jinchao Dou, Ming Kong, China Jiliang Univ. (China); Lihua Lei, Shanghai Institute of Measurement and Testing Technology (China); Rongguang Liang, Wyant College of Optical Sciences, The Univ. of Arizona (United States)
On demand | Presented Live 10 October 2021
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Due to the highly general surface geometry of freeform optics, the measurement of freeform optical surfaces is still a challenging and rewarding issue. Here, we propose a simultaneous multi-surface measurement method based on deep learning for freeform refractive optics, in which the surfaces are reconstructed based on the transmitted wavefront measured with computer-aided deflectometry. By adopting the deep learning approaches in geometrical error calibration and wavefront reconstruction, both the efficiency and robustness is significantly improved, and the surface measurement accuracy in the order of nanometers can be achieved. The proposed method provides an effective, robust and accurate way for testing freeform refractive optics with multiple surfaces and a large slope range.
11895-4
Author(s): Xiaopeng Xie, Liang Xu, Yongjie Wang, Le Shen, Xi'an Institute of Optics and Precision Mechanics (China); Mingyang Yang, Xi'an Institute of Optics and Precision Mechanics (China), Univ. of Chinese Academy of Sciences (China); Wenhui Fan, Hui Zhao, Xi'an Institute of Optics and Precision Mechanics (China)
On demand | Presented Live 10 October 2021
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A variable curvature mirror fabricated by 3D printing which is to be used in zoom imaging system is investigated. First, measurement and parameters correction of the mirror blank printed of AlSi10Mg are done for its precision deviation introduced by the manufacturing method. Second, elementary optical polishing is done for the purpose of Nickel plated. Fine optical polishing is applied on the VCM after the Nickel plated. Third, an actuation test experiment is built and tested by piezoelectric PI actuator and Zygo interferometer. The original surface figure accuracy of 90% radius is 2.225λ/0.394 λ.Within the ultimate testing range of the interferometer, the VCM achieves 8.68μm deformation with the corresponding position change of actuator is 18μm, which is about 50% of it. Finally, an experiment of zoom imaging effect is done. The experiment shows that it does have effect to the zoom imaging which can compensate the defocus within 230.7μm.
Break
Tea/Coffee Break 15:20 - 15:30
Plenary Session II
In person / Livestream: 10 October 2021 • 15:30 - 16:20 China Standard Time
15:30: Welcome and Introduction

Q&A period will follow after the talk
11905-504
Author(s): Peter L. Knight, Blackett Lab., Imperial College London (United Kingdom), UK National Quantum Technology Strategic Advisory Board for UKRI (United Kingdom)
In person / Livestream: 10 October 2021 • 15:35 - 16:05 China Standard Time
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The UK through a mix of government and industry funding has committed more than £1Bn over 10 years to a coordinated programme in quantum technology. Seven years into this programme I will describe here how we got there, and our goals for the future. The UK National Quantum Technology Programme has induced a step change in the UK’s capabilities for pushing forward a new sector in future information technologies. I describe how the programme arose and the activities it supported and influenced to deliver these new capabilities, building on a first phase almost £480M investment across several UK government agencies. The UK programme is now in its second phase, with a further substantial investment by UK government and global industries in the UK making a total of over £1Bn. I will describe our plans for ensuring the advanced quantum science and demonstrator platforms in imaging, sensing, communications and computing developed over the past seven years will drive the formation of the QT sector and embed quantum tech in a broad range of industries. References 1. “Blackett Review: The Quantum Age: technological opportunities.” Government Office for Science, Available: https://www.gov.uk/government/publications/quantum-technologies-blackett-review; https://uknqt.ukri.org/files/strategicintent2020/; Peter Knight and Ian Walmsley 2019 Quantum Sci. Technol. 4 040502
Break
Tea/Coffee Break 16:20 - 16:30
Session 2: Advanced Optical Systems
In person: 10 October 2021 • 16:30 - 18:00 China Standard Time
Session Chair: Fengzhou Fang, Tianjin Univ. (China)
11895-5
Author(s): Zexin Feng, Dewen Cheng, Yongtian Wang, Beijing Institute of Technology (China)
On demand | Presented Live 10 October 2021
11895-6
Author(s): Lin Yang, Rengmao Wu, Jinlei Zhang, Yijie Dai, Zhejiang Univ. (China)
On demand | Presented Live 10 October 2021
11895-7
Author(s): Jiao Bai, Jingwen Li, Gaopeng Xue, Xiaohao Wang, Qian Zhou, Xinghui Li, Tsinghua Univ. Shenzhen International Graduate School (China)
On demand | Presented Live 10 October 2021
11895-8
Author(s): Shan Du, Jun Chang, Yue Zhong, Xuehui Zhao, Beijing Institute of Technology (China); Quanquan Mu, Changchun Institute of Optics, Fine Mechanics and Physics (China)
On demand | Presented Live 10 October 2021
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Miniaturization and compactness are the development direction of imaging spectrometer. More and more imaging spectrometers cannot be miniaturized because of traditional optical components. Thus the optical design space that can highly benefit from the developments in transmission imaging spectrometer based on the metasurface. In this manuscript, we introduce the concept of transmission imaging spectrometer based on metasurface. The spectrometer has a high resolution from 700-800nm spectrum. The key element of the spectrometer is composed of dielectric metasurface, which is used to divide the incident light-spectrum. Meanwhile, the energy of the ultrasurface diffraction order is higher than that of the dispersion order of the traditional grating. The transmission metasystem design can be applied to many optical systems, interferometers, hyperspectral imagers, and computational optical systems, significantly reducing their sizes and increasing their mechanical robustness and potential fo
Session 3: Novel Imaging/Lighting Techniques
In person: 11 October 2021 • 09:20 - 10:20 China Standard Time
Session Chair: Rengmao Wu, Zhejiang Univ. (China)
11895-10
Author(s): Hui Zhao, Xiaopeng Xie, Gangyi Zou, Liang Xu, Xi'an Institute of Optics and Precision Mechanics (China); Jingxuan Wei, Xidian Univ. (China); Xuewu Fan, Xi'an Institute of Optics and Precision Mechanics (China)
On demand | Presented Live 11 October 2021
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In this manuscript, a new focus adjusting method applied for large aperture space-bore camera is proposed. By changing the secondary mirror into a variable curvature mirror (VCM), the defocus compensation could be realized by varying the curvature radius of VCM. One prototype space-borne optical camera whose focal length is 6000mm and aperture is 600mm is used to verify the method numerically. Our research demonstrate that the VCM based focus adjusting is not only very sensitive to defocus variation but also quite suitable for very severe defocus. Specifically, only a slight saggitus variation of less than 4um could compensate amazingly large defocus of about 4mm while maintaining good linearity between the saggitus variation of VCM and defocus, which proves the potential application of this focus adjusting method.
11895-11
Author(s): ZhengHui Zhang, Jingyang Pei, Mailing Xing, Beijing Institute of Space Mechanics and Electricity (China)
On demand | Presented Live 11 October 2021
11895-12
Author(s): Fenli Tan, Chenxin Zeng, Yiqun Ji, Soochow Univ. (China)
On demand | Presented Live 11 October 2021
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In response to the demands of wide field of view (FOV), high spatial and spectral resolution real time spectral imaging of dynamic scenes, a novel Wynne-Offner snapshot hyperspectral imaging system of concentric structure is designed. Then, with numerical aperture of 0.22 and the FOV of 14mm×3mm, a novel Wynne-Offner snapshot hyperspectral imaging system is optimized. The optimized system provides a data-cube of 112×24×293 samples over the 450-650nm working wave band. It achieves a spatial resolution of 9μm and a spectral resolution of 0.7nm. The astigmatism is less than 4μm and it verifies the correctness of the forward theory. The image quality evaluation shows that the RMS radius of the spot diagram of the optimized system is less than 1μm. The smile and keystone are less than 1.4μm and 2.4μm, respectively. The excellent spectral imaging results demonstrate that the optimized system has a great potential application for real-time recognition of moving scenes.
11895-13
Author(s): Simon Thibault, Univ. Laval (Canada)
On demand
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The goal of this project is to combine the power of modern optical design software and the ray tracing through metasurface to build new unprecedented models to support the development of technologies for the next generation of imaging modalities in consumer optics.
11895-14
Author(s): Yunfeng Nie, Vrije Univ. Brussel (Belgium); David R. Shafer, David Shafer Optical Design (United States); Heidi Ottevaere, Hugo Thienpont, Fabian Duerr, Vrije Univ. Brussel (Belgium)
On demand
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We present a generalized differentiable ray-tracing approach suitable for most optical surfaces, including freeform surfaces. The established freeform design method simultaneously calculates multi-surface coefficients with merely the system geometry known. In addition, we provide a ‘double-pass surface’ strategy with the desired overlap (not mutually centered) that enables a component reduction for very compact yet high-performing designs. Two different examples are used to demonstrate the effectiveness of the proposed method. This work provides a robust design scheme for reflective freeform imaging systems in general, and it unlocks a series of new ‘double-pass surface’ designs for very compact, high-performing freeform imaging systems.
Break
Tea/Coffee Break 10:20 - 10:50
Session 4: Computational Imaging
In person: 11 October 2021 • 10:50 - 12:00 China Standard Time
Session Chair: Zexin Feng, Beijing Institute of Technology (China)
11895-15
Author(s): Mingjie Sun, Beihang Univ. (China)
In person: 11 October 2021 • 10:50 - 11:20 China Standard Time
11895-16
Author(s): Hui Zhao, Jiao Mi, Chuang Li, Gangyi Zou, Xi'an Institute of Optics and Precision Mechanics (China); Jingxuan Wei, Xidian Univ. (China); Xuewu Fan, Xi'an Institute of Optics and Precision Mechanics (China)
On demand | Presented Live 11 October 2021
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In this manuscript, experimental research is carried out to investigate the effectiveness of wave-front coding technique in realizing high-resolution imaging without introducing any focusing mechanisms in a large aperture prototype space-borne camera having a focal length of 6000mm and an aperture of 600mm. By only adding a cubic phase mask to the exit pupil with diameter of approximately 80mm and keeping the other optical-mechanical structures unchanged, the extension of depth of focus could be obtained. In the collimator based testing, the depth of focus could be extended 8.5x approximately, which provides another way to realize high-resolution imaging of space targets while designing space-borne optical camera in future.
11895-17
Author(s): Qi Zheng, Xin Jin, Yanqin Chen, Tsinghua Univ. (China)
On demand | Presented Live 11 October 2021
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In this paper, we summarize the characteristics based on the sampling mode and resolution distribution of different light field microscope structures. Considering the observation demand comprehensively, we further designed a new simple light field data acquisition method which is achieved by moving camera to designed position. We also propose corresponding multi images deconvolution reconstruct algorithm considering camera noise characteristics. Finally, we can get the reconstructed 3D volume in large depth range with the uniform resolution in the z direction.
11895-18
Author(s): Andrew R. Harvey, Tomas Aidukas, Guillem Carles, Laura Cowan, Miguel Preciado, Univ of Glasgow (United Kingdom); Andy Wood, Qioptiq (United Kingdom)
On demand
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Modern multi-camera computational imaging can enable new levels of performance beyond what is possible using conventional single-aperture imaging. We will report recent research that demonstrates how multi-camera computational imaging enables low-cost thermal-infrared imaging through 2pi steradians combined with three-dimensional imaging through obscurations. Modern consumer electronics commonly employ multiple cameras to provide multiple fields of view: we will describe how, for the first time, high-resolution imaging can be attained using an array of anamorphic cameras. Microscopy traditionally involves a trade of field of view, spatial resolution and depth of field: we show how multi-camera Fourier-ptychographic microscopy enables sub-micron gigapixel microscopy with a depth of field that is two orders-of-magnitude greater than using conventional microscopy.
Break
Lunch Break 12:00 - 13:30
Poster Session
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
Conference attendees are invited to attend the poster session on Monday afternoon. Come view the posters, ask questions, and network with colleagues in your field. Authors of poster papers will be present to answer questions concerning their papers. Attendees are required to wear their conference registration badges to the poster session.

Poster Setup: Monday 10:00 to 13:00
View poster presentation guidelines and set-up instructions at
https://spie.org/PA/poster-presentation-instructions
11895-30
Author(s): Chengxi Zhu, Jian Bai, Zhejiang Univ. (China)
On demand | Presented Live 11 October 2021
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With the development of science and technology, wide-angle lenses are increasingly considered as the important solution for image acquisition in many fields. The advantage of wide-angle lens is that it has a larger field of view and can receive more information. However, the following defect is that its distortion correction becomes very difficult. If the distortion can be controlled at a relatively low level under the premise of ensuring the field of view and imaging quality, this kind of wide-angle lens will be more competitive in some fields. In this paper, we introduce the non-rotational symmetrical free-form surface to control the distortion effectively, and design a wide-angle lens with low distortion working in 435nm ~ 656nm. In addition, the athermalized design of the lens makes it adapt to more extreme working environment.
11895-32
Author(s): Hua Liu, Luoyang Electro-optical Equipment Research Institute (China); Ronggang ZHU, Science and Technology on Electro-optic Control Laboratory, China (China); Quanxin Ding, Science and Technology on Electro-optic Control Laboratory (China)
On demand | Presented Live 11 October 2021
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With an interval which between the elements as the initial amount, the form of motion of the elements is used as the free amount, and the distribution of the optical focal length and the form of the element motion can be obtained by calculating the equation sets. With the global method, the bandwidth has been amplified by ten times as compared with that of traditional ones.
11895-33
Author(s): Qun Hao, Zhikuo Li, Chuanxun Chen, Jie Cao, Yang Cheng, Beijing Institute of Technology (China)
On demand | Presented Live 11 October 2021
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A compact adaptive liquid lens actuated by dielectric elastomer (DE) with transparent conductive droplet is proposed in this paper. The droplet not only acts as the material of the adaptive liquid lens because of its high transparency but also works as the compliant electrode of the DE due to its conductibility. Two annular polydimethylsiloxane (PDMS) membranes adhere to the central area of the top and bottom surface of the DE. A mixture liquid of glycerol and sodium chloride droplet is dropped into the two annular PDMS membranes. When the droplet is subjected to a voltage supply, the area of the DE where contacts the droplet expands, which induces an increase in the lens diameter that corresponds to a decreasing in the lens thickness since the volume of the droplet is constant. Therefore, the focal length of the adaptive liquid lens increases. The results show that the adaptive liquid lens has a compact structure and high transparency of over 86.1% at visible wavelength.
11895-34
Author(s): Ji Feng Sun, Zhejiang Univ. (China); Xiaotong Li, Zhejiang Univ. (China), State Key Lab of Modern Optical Instrumentation,College of Optical Science and Engineering (China)
On demand | Presented Live 11 October 2021
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As the most widely used method in optical system design, the damped least squares (DLS) method performs well in convergence speed. However, the fatal flaw of DLS method is that it is easy to get caught into local minima. Thus, some intelligent algorithms are adopted in optical system designing for global optimization. Genetic algorithm (GA) has the unique advantages of wide scope of application and powerful global search capability. In this paper, we proposed a new optimization method for optical system design, which is based on an improved genetic algorithm and combined with the damped least squares method. Besides, a machine vision lens is designed by the proposed method, which verified the effectiveness of the method.
11895-35
Author(s): Yu Zhang, Shanghai Aerospace Electronic Technology Institute (China); Huiping Zhang, Shanghai Aerospace Technology Research Institute (China); Fang Han, Beijing Institute of Space Environment Engineerign (China); Haiyang Ding, Jiyang Shang, Shanghai Aerospace Electronic Technology Institute (China)
On demand | Presented Live 11 October 2021
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When the spatial visible light camera images the detection target, non-imaged light in the space also reaches the imaging surface through the lens, forming an image on the detector. Some of the light is imaged on the image surface after multiple reflections inside the lens. These non-target images affect the image quality of the camera. In severe cases, the camera may not work properly. In order to reduce the influence of stray light on the imaging system and improve the imaging performance of the camera, firstly, the generation mechanism of stray light in the visible light system is analyzed, and the stray light suppression measures are proposed. Secondly,the system is then analyzed using ZEMAX software. The optical system design of the camera with the previous stray light problem was improved, and the stray light modeling analysis was performed on the improved result, and finally the space reconnaissance camera that satisfies the use requirements was obtained.
11895-36
Author(s): Jingjing Su, Nan Li, Jiapeng Mou, Yishi Liu, Xingfan Chen, Huizhu Hu, Zhejiang Univ. (China)
On demand | Presented Live 11 October 2021
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Abstract: In this paper, the gradient force and scattering force of two kinds of different sinusoidal modulated Gaussian beams (SMGBs(n=2), SMGB (n=4)) and Gaussian beam (Gb) are analyzed, and their ability to capture particles are studied. It is found that sinusoidal modulated Gaussian beams have multiple stable capture positions at the focal plane than Gaussian beam. Under the same circumstance, Monte Carlo stochastic simulation method is used to simulate the tendency characteristics of particles under the effect of gradient force and scattering force, which verifies the theoretical analysis results. Therefore, the research results of this paper have certain guiding significance in the experiment and application of multi-position optical tweezers.
11895-37
Author(s): Yimou Luo, Xiaotong Li, Qi Huang, Zhejiang Univ. (China)
On demand | Presented Live 11 October 2021
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Following the principle of Gaussian optics, the optical first order derivatives are significant to analyse the sensitivity of a lens system with its structural parameters changing. Thus, we proposed a scheme to use the first order derivatives of the height of a real ray on the image surface in a lens system versus that on the pupil surface as a merit function to improve the tolerance sensitivity of the whole system. A test program using the ZPL language in Opticstudio has preliminarily confirmed the effectiveness of our proposed methods, which is theoretically appropriate to all lens systems.
11895-38
Author(s): Ting Liu, Xiaohang Zhou, Zejie Lin, Jiale Chen, Meiai Lin, Shantou Univ. (China)
On demand | Presented Live 11 October 2021
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In this manuscript, we develop a 3D-printing based microfluidic device for light scattering imaging of single cells. A rapid fabrication method to make microfluidic device that enables 3D-hydrodynamic focusing by utilizing 3D printing technique is proposed. The focusing effect of the microfluidic cytometer was measured and shows the ability to confine the cells to flow near the center stream along the channel. Also, the standard beads with 9.51 μm in diameter were used to test the reliability of the device. The collected light scattering images are in good agreement with simulation results. We suggest that the 3D-printing based light scattering microfluidic device is in principle applicable for fast, label-free detection of single cells.
11895-39
Author(s): Jiarui Ji, Tong Yang, Jie Chen, Lei Yang, Hongbo Xie, Tianjin Univ. (China)
On demand | Presented Live 11 October 2021
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In view of the computational imaging theory, a simple long-focus optical system design method with the optical/image co-design is proposed and demonstrated in this paper. Based on the idea of global optimization, this method considers the two independent links of optical design and image restoration as a whole. The imaging quality requirements in the optical system design are relaxed at the front end, and the image restoration algorithm is used to remove the residual aberrations in the back end. This method can not only obtain the same or even higher imaging performance, but also reduce the complexity of the optical system.
11895-40
Author(s): Chenlin Zhang, Institute of Southwestern Communication (China); Jingtang Luo, State Grid Sichuan Economic Research Institute (China); Yang Li, Lifeng Fu, Heng Wang, Wei Huang, Bingjie Xu, Institute of Southwestern Communication (China)
On demand | Presented Live 11 October 2021
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Recently, the time synchronization via optical fiber, (e.g., two-way fiber time transfer technique, and round-trip time transfer technique) is more and more attractive, due to its higher precision, and longer distance. However, because this method is based on the assumption that the forward and backward propagation delays of one optical fiber are nearly the same, it may fail to achieve time synchronization due to link asymmetry. To resolve this problem, we propose a time filtering method to detect link asymmetry and mitigate time asynchronization caused by link asymmetry. Specifically, we create an array to record four time parameters, i.e., round-trip time, time offset between Server and Client, the difference of round-trip time, and the difference of time offset.
11895-41
Author(s): Xu Sun, Jia Yu, Huiping Liu, Ocean Univ. of China (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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Due to the high coherence of the laser itself, as a light source, it will be affected by random factors in the light path, resulting in a large number of speckles, so speckle suppression is a key problem in laser display. In this paper, a composite speckle elimination method is proposed by combining the colloidal Brownian motion to reduce the optical coherence with the active speckle modulation feedback. At the same time, a set of speckle evaluation and feedback system is built, which simulates human eye observation with high frame rate and high-resolution imaging system to monitor the speckle on the screen in real-time. The experimental results show that the composite speckle elimination method can effectively suppress the speckle in the laser projection system, which plays an important auxiliary role in the application of laser projection system.
11895-42
Author(s): Xianlin Song, Nanchang Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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Axial cosinoidal structured illumination that the intensity along the axis presents a cosinoidal distribution plays important role in many fields, such as optical tweezers, optical micromanipulation and optical modulation. However, the generation of axial cosinoidal structured illumination with controllable phase and period is a challenge. Here, we propose a novel method for generating axial cosinoidal structured illumination by using phase-only spatial illumination modulator. We implemented axial cosinoidal structured illumination using holographic technique. The computer generates two concentric circular slits with different radius, a prism phase is applied on the slits to tilts the beam that incidents on the slits away from the optical axis. Different annular beam produce Bessel beams with different axial wave vectors, axial cosinoidal structured illumination can be obtained from the interference between two Bessel beams.
11895-43
Author(s): Niuhu Wang, Aijun Zeng, Wenqing Jiang, Baoxi Yang, Shanghai Institute of Optics and Fine Mechanics (China)
On demand | Presented Live 11 October 2021
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Spectral confocal displacement sensor is a high-precision, non-contact displacement sensor, which can be used to measure the surface morphology, thickness and distance. In this paper, the basic principle of spectral confocal displacement measurement is discussed, and a global lens group is designed by using codev optical design software. The design method of spectral confocal displacement sensor lens group and aberration analysis are given. The working wavelength of the lens group is 450nm-650nm, the measurement range is larger, up to 2mm, the image space numerical aperture is 0.3, the axial response FWHM is better than 5um, and the resolution is higher. The linear regression analysis shows that the determination coefficient between wavelength and displacement is better than 0.99, and the linear relationship between displacement and wavelength is good.
11895-44
Author(s): Zouhua Chen, Yuwei Zhu, Xianlin Song, Nanchang Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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We propose an optimization method to eliminate the influence of conical concave acoustic lens on beam transmission. A calibration mirror is added to the acoustooptic coupling prism with conical concave acoustic lens at the bottom, and the deterioration of the cone concave acoustic lens to the beam transmission is eliminated by optimizing the surface shape and thickness of the calibration mirror by Zemax. The optimization effect is evaluated by analyzing the spot. The simulation results show that the optimization method can eliminate the influence of the conical concave acoustic lens on the beam transmission, make the focal point and the focal point keep the coaxial focus, and improve the detection efficiency of the photoacoustic signal. This work is of theoretical significance for the systematic study of large depth of field photoacoustic microimaging.
11895-45
Author(s): Ningning Shi, Tsinghua Univ. (China); Shengtong Wang, Tsinghua Shenzhen International Graduate School, Tsinghua University (China); Gaopeng Xue, Tsinghua university (China); Mengfang Liu, Yaodong Han, Tsinghua Univ. (China); Junhao Zhu, Tsinghua Univ. (China); Kai Ni, Tsinghua Univ. (China); Qian Zhou, Xiaohao Wang, Tsinghua Shenzhen International Graduate School, Tsinghua University (China); Xinghui Li, Tsinghua Univ. (China)
On demand | Presented Live 11 October 2021
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Grating interferometer is an important means of precision displacement measurement. The optical signal processing system can effectively expand the practicability of the grating. The current research on the online measurement system of grating rulers still has problems such as the less measurement degrees of freedom, incomplete phase correction and the small number of channels . This paper independently develops and designs an online processing system based on FPGA for the grating ruler with 6 degrees of freedom. The main advantage of this system lies in the high accuracy of six degrees of freedom real time measurement, 40 data communication channels and low time delay, and the related experiments are carried out to verify the conclusions.
11895-47
Author(s): Huazhong Xiang, Lu Zhang, Xiaodie Zhan, Yaqiong Wang, Univ. of Shanghai for Science and Technology (China); Yunjin Zhang, University of Shanghai for Science and Technology (China); Gang Zheng, Cheng Wang, Dawei Zhang, Songlin Zhuang, Univ. of Shanghai for Science and Technology (China)
On demand | Presented Live 11 October 2021
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The weight distributions (WDs) of spherical and cylindrical power deviations with the multiple convolution processing schemes indicate that the areas of the far and near zones can be increased by changing the WD without changing the distribution of the mean sphere. When the number of the multiple convolution processing schemes changed from 0 to 15, the areas of the far and near areas increase by 35.7% and 76.5%, respectively, and the maximum peripheral astigmatism increased from 0.75 to 1.5 ADD. The increasing maximum peripheral astigmatism will lengthen the period for the wearer to wear the PALs, and increase discomfort.
11895-48
Author(s): Jianbin Ma, Guangzhen Luo, Pengfei Wang, Key Lab. of Semiconductor Materials Science, Institute of Semiconductors (China), Ctr. of Materials Science and Optoelectronics Engineering, Univ. of Chinese Academy of Sciences (China); pengfei ma, ruiting wang, Key Lab. of Semiconductor Materials Science (China); Xuliang Zhou, Jiaoqing Pan, Yejin Zhang, Key Lab. of Semiconductor Materials Science, Institute of Semiconductors (China), Ctr. of Materials Science and Optoelectronics Engineering, Univ. of Chinese Academy of Sciences (China)
On demand | Presented Live 11 October 2021
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We propose and numerically investigate a double-cladded athermal waveguide structure aiming at broadband low anomalous dispersion operation. Single-crystal aluminum nitride (AlN) is the core of the waveguide, cladding with silicon oxide (SiO2) and titanium dioxide (TiO2). TiO2 with a negative thermo-optic coefficient (TOC) is used to realize material thermal compensation for AlN. By optimizing the waveguide structure parameters, it shows a near-zero broadband effective TOC,±4×10-6/K over a 1770-nm bandwidth from 1830 to 3600 nm. Besides, it also has low anomalous dispersion, from -20 to 20 ps/nm/km in the same wavelength range. Different with the conventional strip waveguide, the waveguide is a double cladded structure, which is easy to fabricate in practice. Furthermore, this structure will not damage the single crystal state of aluminum nitride, maintaining its original excellent optical properties.
11895-28
Author(s): Ruslan V. Shimansky, Victor Korolkov, Dmitrij Belousov, Roman I. Kuts, Institute of Automation and Electrometry of the SB RAS (Russian Federation)
On demand
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This paper presents a method for estimation of errors in fabricating CGH occurred from positioning errors of a laser writing system. The proposed method is based on writing and diffractometric analysis of embedded 2D-marks. The first part is formed before writing and the second part is formed directly in the process of CGH writing. The displacement of the second part of the 2D-mark relative to the first is defined by positioning errors. When the 2D-mark is illuminated with a probe laser beam, the shift leads to a redistribution of the diffraction efficiency between the diffraction orders. The analysis of the obtained diffraction pattern makes it possible to estimate the errors of the CGH structure simultaneously along both coordinates.
11895-31
Author(s): Muyang Li, Liaocheng Univ. (China); Ragini Singh, Liaocheng University (China); Bingyuan Zhang, Santosh Kumar, Liaocheng Univ. (China)
On demand
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The core mismatch formed by the splicing of different fiber cores and tapered fiber is beneficial to the sensing. In this paper, a single-mode fiber (SMF)- tapered multi-mode fiber (tapered MMF)-single-mode fiber structure was fabricated and used as a sensor to detect uric acid. The gold nanoparticles (AuNPs)/zinc oxide (ZnO) nanoparticles were fixed on the tapered surface to enhance the localized surface plasmon resonance (LSPR) and its sensing performance. The experimental results show that the optical fiber sensor can detect different concentrations of uric acid solution successfully and has a linear response in a certain range for biomedical applications.
11895-49
Author(s): Victor P. Korolkov, Ruslan K. Nasyrov, Andrey G. Sedukhin, Dmitry A. Belousov, Roman I. Kuts, Institute of Automation and Electrometry of the SB RAS (Russian Federation)
On demand
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Diffractive Transmission Sphere (DTS) can be successfully used for interferometric testing. Unfortunately, phenomena of annular rings occur on interferogram in a case of small period of diffractive patter. This effect reduces quality of measurements and became critical for apertures close to f/1. This work is devoted to computer simulation of such effects and development of technique for their partial compensation. It was proposed to do this compensation by modifying duty cycle. Experimental DTS with variable duty-cycle was fabricated and tested. Computer simulation on the base of the rigorous coupled wave analysis was performed.
11895-50
Author(s): Elena A. Tsyganok, Anastasiya D. Kozhina, ITMO Univ. (Russian Federation); Shaohua Gao, Changchun Univ. of Science and Technology (China)
On demand
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Recently, more and more attention is paid to the multichannel optical system. They are often used in microscopy. Examples include metallographic microscopy, confocal microscopy, laser scanning microscopy, optical coherence tomography, and others. Usually, one channel of such systems is lighting, and the other is observation. Such systems usually do not pay attention to the uniformity of the divided light flux. Here it is important to illuminate the object and obtain an image, and if the illumination is insufficient, the luminous flux given by the source is increased. However, if both channels of the system are used for imaging (possibly with different characteristics), the uniformity of this splitting of the optical emission is an important part. Otherwise, we risk not getting the image we need in one of the channels. The paper presents the features of optical systems that ensure uniform separation of optical emission. Examples of such optical systems are given.
11895-51
Author(s): Andrey D. Zhdanov, Andrei Lemeshev, Dmitry Zhdanov, Vadim Sokolov, ITMO Univ. (Russian Federation); Eugene Denisov, M. V. Keldysh Institute of Applied Mathematics (Russian Federation)
On demand
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This paper presents a raytracing-based method of synthesis of realistic images in a complex space containing gradient lenses. The proposed solution is based on the Runge-Kutta method and allows raytracing in a space with a gradient medium. The authors have developed an effective solution, which allows dividing the complex lens boundary into voxels and providing a fast ray tracing procedure inside the voxel. In addition, the authors considered possible solutions for calculating luminance components within a gradient refractive index medium. The study showed that the most efficient way to calculate luminance is based on stochastic bidirectional raytracing with photon maps.
11895-52
Author(s): Alla Uvarova, D. Hung Nguyen, ITMO Univ. (Russian Federation); Shaohua Gao, Changchun Univ. of Science and Technology (China); Alexey Bakholdin, ITMO Univ. (Russian Federation)
On demand
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The paper describes a way of simple optical systems design. The presented computer tool synthesizes "photographic objective" type systems according to given aberration parameters. It is directly applicable to micro objectives, which are photographic systems in a backward ray trace. The paper compares lenses with f’=50 mm, NA=0,1, 2y=6 mm designed as cemented doublet plus single lens and as pair of cemented doublets. Despite the second lens is a more complex system, its image quality is no better than provided by simplified system.
11895-53
Author(s): Igor Kinev, Igor Potemin, Andrei Lemeshev, Andrey D. Zhdanov, ITMO Univ. (Russian Federation); Ludmila Arhipova, Sergei Larionov, S. I. Vavilov State Optical Institute (Russian Federation); Dmitry Zhdanov, ITMO Univ. (Russian Federation)
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The paper considers a method for calculating the distribution of light radiation on the receiver caused by its scattering on the surfaces of an optical device. The calculation is based on the method of bidirectional stochastic ray tracing with photon maps. The proposed method is highly efficient due to the simultaneous use of the forward and backward photon maps that accumulate the distributions of light radiation and the visibility of the scattering elements correspondingly. Effective methods have been developed for the forming, storage, and access to photon maps, which provide not only high computational efficiency but also the ability to visualize the sources of stray light in optical devices. The efficiency of this method was demonstrated by examples of calculating stray light for several optical devices.
11895-54
Author(s): Dat Nguyen-Van, Xuan Du Dang, Thanh Dat Vu, Viettel High Technology Industry Corp. (Vietnam)
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This paper reports a mid-wave infrared lens design for Infrared search and track (IRST) system using an integrated fast steering mirror to provide back-scanned motion for maintaining the line-of-sight stability. The lens design has a large Field of view ( FOV) of 10o x 8o for single frame and a maximum scanning angle of 2.16o. To be able to scan a large number of objects in a long-range distance at high scanning rate, the lens is designed to work with a F/2 SXGA (1280 x 1024) cooled detector having pixel pitch of 15µm. Also, an implemented non-rotationally symmetric field mapping is successfully used in the design to keep all field of points stable on FPA during back-scanning.
11895-55
Author(s): Victor P. Korolkov, Ruslan K. Nasyrov, Vladimir Khomutov, Dmitry A. Belousov, Roman I. Kuts, Institute of Automation and Electrometry of the SB RAS (Russian Federation)
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Conformal correctors for high-power solid-state YAG:Nd3+ lasers are used for compensation of density variations inside active media. These correctors decrease laser beam aberrations and allows better focusing of laser light. Fabrication was done by direct laser writing on photoresist. Method of specular spectrometric reflectometry to control the shape of correctors at the stage of relief in a photoresist is considered. The combination of the methods used significantly increases the productivity of the production of correctors, combined with a reduction in the cost of the process.
Session 5: Optical System Designs I
In person: 11 October 2021 • 14:30 - 15:50 China Standard Time
Session Chair: Daodang Wang, China Jiliang Univ. (China)
11895-19
Author(s): Yijie Dai, Yingli Liu, Fanqi Shen, Rengmao Wu, Zhejiang Univ. (China)
On demand | Presented Live 11 October 2021
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Freeform surfaces are widely used in optical design, due to the high design degree of freedom. The aberration theory of freeform optics can better lead designers to obtain a good structure. However, the existing aberration theory of freeform optics is only suitable for the optical system with a relatively small field-of-view (FOV). In this case, each field area (footprint) shows approximately the same shape and size, and positions of footprints across a surface have a linear relationship with fields. A wide FOV freeform optical system is analyzed in this paper. Parameters of all fields based on real-ray trace and nonlinear interpolation can be employed to calculate the aberration generated by freeform terms. Then, to correct aberrations, coefficients of freeform terms are calculated using the least-square fitting method. By bringing back the coefficients to the optical system, the result shows better performance when using the nonlinear interpolation.
11895-20
Author(s): Yue Zhong, Jun Chang, Shan Du, Jiajing Cao, Huilin Jiang, Beijing Institute of Technology (China); Jie Sui, Beijing Institute of Control Engineering (China)
On demand | Presented Live 11 October 2021
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The telescope system always has a strong demand for miniaturization and lightweight. Diffractive optical elements (DOEs) show great promise for this field. We compared diffractive optical elements with traditional optical elements in the same optic parameters. Confirmed that it has very obvious advantages when applied in airborne optical systems with high requirements on volume and weight. We demonstrate a telescope system with a refractive-diffraction hybrid lens. By sharing the focal power of the diffractive surface, the design and processing of diffractive elements are simpler. The design results show that the system chromatic aberration corrected well.
11895-21
Author(s): Yihan Wang, Zhaofeng Cen, Xiaotong Li, State Key Lab. of Modern Optical Instrumentation, Zhejiang Univ. (China)
On demand | Presented Live 11 October 2021
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Unlike the conventional design of aspheric shaping systems, in order to provide a laser source for applications such as multi-beam laser interference, which can maintain evenly distributed power over a large distance, the influence of shape parameter and aperture on long-distance propagation performance of Kepler refractive beam shaping system is studied. Current work describes the lens, designed automatically by using ZEMAX programming language (ZPL), and simulations of Kepler refractive shaping systems of flattened Lorenz (FL) beams with different shape parameters and apertures.
11895-22
Author(s): Chenxin Zeng, Fenli Tan, Yiqun Ji, Soochow Univ. (China)
On demand | Presented Live 11 October 2021
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For the demands of light weight, small size, wide field of view (FOV) and real time airborne spectral imaging, a spectral imaging system with lightweight and compactness is designed. The spectral imaging system mainly consists of two optics, a front monocentric fold objective and an Offner spectral imaging array. The optimized spectral imaging system is with a full FOV of 110°, focal length of 110 mm, F number of 4.8 and a working wavelength band of 480 nm to 760 nm. The spectral resolution is about 0.6 nm, the maximum RMS radius on image plane is less than 3 μm, and the MTF value is over 0.5@85 lp/mm. The tube length is only 85 mm. The optimized spectral imaging system not only achieves a real time spectral imaging in a wide FOV, but also realizes the miniaturization. It will make profound theorical value in the airborne remote sensing field.
Session 6: Optical System Designs II
11895-24
Author(s): Juan Manuel Franco Sanchez, Utsunomiya Univ. (Japan); Joel Cervantes Lozano, Ctr. Universitario de Ciencias Exactas e Ingenierías, Univ. de Guadalajara (Mexico); Keiichiro Kagawa, Research Institute of Electronics, Shizuoka Univ. (Japan); Hajime Nagahara, Institute for Datability Science, Osaka Univ. (Japan); Yoshio Hayasaki, Utsunomiya Univ. (Japan)
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We describe an optical time-of-flight system that is used to measure the initial and continuous position of a target on the optical axis. Once the target is located, a lens system, mounted on a motorized stage, approaches the target. The lens system uses a commercially available variable focal length lens that is controlled by a specially designed program and a fixed focal lens. A tracking and autofocus system was developed to detect and focus the target, respectively. The system was tested for reflective objects of various percentages. A master program was developed in LabVIEW to sequence and control the entire system.
11895-26
Author(s): Thanh Dat Vu, Xuan Du Dang, Dat Nguyen-Van, Viettel High Technology Industry Corp. (Vietnam)
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A high magnification mid-wave infrared (MWIR) continuous zoom lens system that is compatible with a high-resolution focal plane array (FPA) has been successfully designed. With only two moving elements, the design has been able to maintain its performance on an SXGA 15-μm cooled detector throughout the zoom range with a maximum focal length of 1200 mm. The developed zoom lens system plays a major part in extremely long range observation and surveillance applications.
11895-29
Author(s): Vadim Bulavintsev, Dmitry Zhdanov, ITMO Univ. (Russian Federation)
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We propose a generalized method for adapting and optimizing algorithms for efficient execution on modern graphics processing units (GPU). The method consists of several steps. First, build a control flow graph (CFG) of the algorithm. Next, transform the CFG into a tree of loops and merge non-parallelizable loops into parallelizable ones. Finally, map the resulting loops tree to the tree of GPU computational units, unrolling the algorithm's loops as necessary for the match. The method provides a convenient and robust mental framework and strategy for GPU code optimization. We demonstrate the method by adapting a backtracking search algorithm to the GPU platform and building an optimized implementation of the ResNeXt-50 neural network.
Conference Chair
Beijing Institute of Technology (China)
Conference Chair
Kidger Optics Associates (United Kingdom)
Conference Chair
Kobe Univ. (Japan)
Conference Chair
Zhejiang Univ. (China)
Program Committee
Kyoto Institute of Technology (Japan)
Program Committee
Zhejiang Univ. (China)
Program Committee
Beijing Institute of Technology (China)
Program Committee
Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences (China)
Program Committee
Vrije Univ. Brussel (Belgium)
Program Committee
National Kaohsiung First Univ. of Science and Technology (Taiwan, China)
Program Committee
Beijing Institute of Technology (China)
Program Committee
Facebook Technologies, LLC (United States)
Program Committee
Univ. of Shanghai for Science and Technology (China)
Program Committee
Jae Young Joo
Korea Photonics Technology Institute (Korea, Republic of)
Program Committee
Myongji Univ. (Korea, Republic of)
Program Committee
Osaka Univ. (Japan)
Program Committee
Jaejoong Kwon
Samsung Display Co., Ltd. (Korea, Republic of)
Program Committee
Korea Research Institute of Standards and Science (Korea, Republic of)
Program Committee
Wyant College of Optical Sciences (United States)
Program Committee
ITMO Univ. (Russian Federation)
Program Committee
Huazhong Univ. of Science and Technology (China)
Program Committee
KU Leuven (Belgium)
Program Committee
Wakayama Univ. (Japan)
Program Committee
Dankook Univ. (Korea, Republic of)
Program Committee
Institut d'Optique Graduate School (France)
Program Committee
Shenzhen Univ. (China)
Program Committee
Sandy To
The Hong Kong Polytechnic Univ. (Hong Kong, China)
Program Committee
Technische Univ. Delft (Netherlands)
Program Committee
China Jiliang Univ. (China)
Program Committee
Arizona Optical Metrology LLC (United States)
Program Committee
Jun Zhu
Tsinghua Univ. (China)
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