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Conference 11890

Advanced Lasers, High-Power Lasers, and Applications XII

In person: 10 - 12 October 2021
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  • Opening Ceremony and Plenary Session I
  • 1: Ultra-Intense/High-Power Lasers I
  • Plenary Session II
  • 2: Ultra-Intense/High-Power Lasers II
  • 3: Fiber/Solid Lasers I
  • 4: Fiber/Solid Lasers II
  • Poster Session
  • 5: GaS Lasers and Others
  • 6: Fiber/Solid Lasers III
  • 7: Fiber/Solid Lasers IV
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: Ultra-Intense/High-Power Lasers I
In person: 10 October 2021 • 13:30 - 15:10 China Standard Time
Session Chair: Xiaoyan Liang, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences (China)
11890-1
Author(s): Guoqing Chang, Chinese Academy of Sciences (China); Zhiyi Wei, Institute of Physics (China)
In person: 10 October 2021 • 13:30 - 14:00 China Standard Time
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Yb-fiber amplifiers based on pre-chirp managed amplification (PCMA) can directly emit 100-W, <50-fs pulses. However, the pulse energy of PCMA is ultimately limited by self-focusing and the maximum pulse energy that can be achieved from an Yb-fiber PCMA is about 4 μJ. In this presentation, we will review the recent progress in developing high-power Yb-fiber PCMA system with a focus on increasing the pulse energy by incorporating divided pulse amplification (DPA) based on composite birefringent plates to construct the divider/recombiner. Especially, we show such a pre-chirp managed DPA system can produce 100-μJ, <50-fs pulses with >2-GW peak power.
11890-2
Author(s): Guoqiang Xie, Zhipeng Qin, Yicheng Zhou, Shanghai Jiao Tong Univ. (China)
In person: 10 October 2021 • 14:00 - 14:30 China Standard Time
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Mid-IR ultrafast laser sources are becoming increasingly attractive for applications from spectroscopy to high-field physics. Fluoride fiber lasers provide an excellent platform for generation of high-power mid-IR ultrafast laser. In this talk we will introduce the recent progress on ultrafast fluoride fiber lasers at 3 μm. The soliton duration from mode-locked fluoride fiber laser has been shortened to 131 fs by optimizing the balance between dispersion and nonlinearity. Breathing pulse mode-locking in fluoride fiber laser has been realized, directly producing a pulse peak power beyond 40 kW from oscillator. By dispersion-managed amplification and self-compression process, we demonstrated generation of 5-optical-cycle (46 fs) pulse with a peak power of 1.8 MW, which has approached to high-field regime for ionization of atom and molecule. The high-power ultrafast fluoride fiber laser shows a wide prospect for applications such as semiconductor micro-processing, high-field physics, etc.
11890-3
Author(s): Peng Wang, Xiong Shen, Jun Liu, Shanghai Institute of Optics and Fine Mechanics (China)
In person: 10 October 2021 • 14:30 - 14:50 China Standard Time
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A single-shot fourth-order auto-correlator based on the cross-polarized wave generation (XPW) is proposed for the temporal contrast measurement, where the XPW process owns the advantages of higher energy conversion efficiency, more compact setup, and less sensitive to the misalignment in comparison to self-diffraction process. The measurement dynamic of 10^12 is obtained with only 6 mJ input laser pulse, where the input beam for XPW is focused by a cylindrical lens and XPW signal with the energy of 400 μJ and time duration of 28 fs is obtained. Furthermore, BBO crystal with the thickness of 6 mm and cutting angle of 57 degree is used for the sum frequency generation (SFG) process to benefit the correlation efficiency. The compact setup is easy adjusted which will help to investigate the temporal contrast property of high power laser pulses.
11890-4
Author(s): Yilan Jiang, Guorui Zhou, Xinxiang Miao, Longfei Niu, China Academy of Engineering Physics (China)
In person: 10 October 2021 • 14:50 - 15:10 China Standard Time
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Study on Influencing Factors of Contact Angle Method for Surface Cleaning of Metal Materials in Large Laser Installations: Among the cleanliness tests, contact angle test method is widely used as a rapid and semi-quantitative method for the detection of organic contaminants on the surface of mechanical structures. However, it is affected by many factors, which further affect the accuracy and reliability of the test results, and the quality judgment of clean treatment products. In this paper, the surface roughness of metal materials, detection environment temperature, humidity, detection water and other common change parameters were studied to investigate their influences on the surface contact angle of metal materials.
Break
Tea/Coffee Break 15:10 - 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: Ultra-Intense/High-Power Lasers II
In person: 10 October 2021 • 16:30 - 17:40 China Standard Time
Session Chair: Jin Woo Yoon, Gwangju Institute of Science and Technology (Korea, Republic of)
11890-5
Author(s): Xiaoyan Liang, Shanghai Institute of Optics And Fine Mechancis (China)
In person: 10 October 2021 • 16:30 - 17:00 China Standard Time
11890-6
Author(s): Jinhu Long, Kaikai Jin, Tianyue Hou, National Univ. of Defense Technology (China); Qi Chang, National University of Defense Technology (China); Rongtao Su, Yanxing Ma, Pengfei Ma, Jian Wu, Pu Zhou, National Univ. of Defense Technology (China)
On demand | Presented Live 10 October 2021
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In this letter, a two-stage phase control technique is proposed to increase the control bandwidth of the target-in-the-loop (TIL) system. In this technique, the first stage phase control is enabled by LiNbO3 phase modulator to compensate the phase noises in the fiber amplifiers, and the second stage phase control is enabled by the liquid crystal (LC) to compensate the phase noises induced by the atmospheric turbulence. We built a TIL coherent beam combining system with 3-channel coherent fiber lasers over a 40 m atmospheric propagation path. In our experiment, the stochastic parallel gradient descent (SPGD) algorithm was employed for phase control. When the phase control system was in the close loop, the performance of laser beam projection was significantly improved, and the phase locking bandwidth for transmitter side phase distortions reached 1 kHz. This method can be used for applications such as energy transmission and free-space optical communication.
11890-7
Author(s): Longfei Niu, Yilan Jiang, Guorui Zhou, Xinxiang Miao, Caizhen Yao, Haibing Lv, China Academy of Engineering Physics (China)
In person: 10 October 2021 • 17:20 - 17:40 China Standard Time
11890-8
Author(s): Jin Woo Yoon, Il Woo Choi, Jae Hee Sung, Yeong Gyu Kim, Gwangju Institute of Science and Technology (Korea, Republic of); Hwang Woon Lee, Institute for Basic Science (Korea, Republic of); Seong Ku Lee, Chang Hee Nam, Gwangju Institute of Science and Technology (Korea, Republic of)
On demand
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To realize the ultrahigh intensity over 10^23 W/cm^2, we carried out the wavefront correction and tight focusing of the CoReLS petawatt laser. By the wavefront correction and tight focusing of the CoReLS petawatt laser with two-stage adaptive optics systems and an f/1.1 (f=300 mm) off-axis parabolic mirror, we obtained a near-diffraction-limited focal spot. The measured peak intensity was (1.1±0.1)×10^23 W/cm2, the first realization of the laser intensity over 10^23 W/cm^2. With the PW laser of intensity over 10^23 W/cm^2, we plan to explore strong field QED phenomena and proton/ion acceleration dominated by the RPA mechanism.
Session 3: Fiber/Solid Lasers I
In person: 11 October 2021 • 08:30 - 10:10 China Standard Time
Session Chair: Guoqing Chang, Institute of Physics, Chinese Academy of Sciences (China)
11890-9
Author(s): Yan Feng, Shanghai Institute of Optics and Fine Mechanics (China)
In person: 11 October 2021 • 08:30 - 09:00 China Standard Time
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Single frequency fiber amplifiers are being widely applied in quantum information research and technology development, for their power scalability, robustness, high beam quality, and more significantly wavelength versatility. We report our progress in developing high power low noise single frequency Yb, Er, and Raman fiber amplifiers for various quantum applications, usually including frequency doubling to visible and ultraviolet regime.
11890-10
Author(s): Pu Zhou, Jiangming Xu, Jun Ye, Yang Zhang, Xiaoya Ma, Hanshuo Wu, Hu Xiao, Jinyong Leng, Tianfu Yao, Liangjin Huang, Zhiyong Pan, National Univ. of Defense Technology (China)
In person: 11 October 2021 • 09:00 - 09:30 China Standard Time
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Quantum defect (QD) is one of the most important physical mechanisms that determine the power scaling potential of lasers. In this paper, by taking fiber laser as a typical example, the history of power scaling from the viewpoint of QD is briefly reviewed, and technical routes for low-quantum-defect operation is introduced. Then we will summarize recent progress of the development of low-quantum-defect fiber lasers, including high power in-band pumped silica fiber lasers, lasing based on multicomponent special fiber, and lasing based on boson peak in phosphorus-doped fiber, and so on. Perspective on low-quantum-defect fiber lasers will be discussed.
11890-11
Author(s): Haizhou Huang, Hongchun Wu, Wen Weng, Huagang Liu, Yan Ge, Jinhui Li, Wenxiong Lin, Fujian Institute of Research on the Structure of Matter (China)
On demand | Presented Live 11 October 2021
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We present a compact diode-pumped Tm/Ho:YLF laser, via integrating the Tm-doped and Ho-doped YLF crystals into a single bulk gain medium. Gain spectral model was developed first to the predict the potential Tm:YLF laser wavelength using different types of output coupling, for enhancing resonant absorption of the Ho:YLF crystal. Further verification were carried out by intra-cavity pumping the Ho:YLF laser with a Tm:YLF laser, where maximum output power of 11.3 W at 2.06 μm with near diffraction limited beam quality was obtained with conversion efficiency of 28.2% by considering the incident 793 nm diode power. In the Tm/Ho:YLF laser, maximum output power of 10.2 W at 2063 nm with power instability of 0.55% was obtained, corresponding to a slope efficiency of 29.6 %.and optical conversion efficiency of 25.5%. The results provide a compact, accessible, and efficient Ho laser scheme, with has potential applications in wind lidar, surgeries, material processing, and nonlinear frequency con
11890-12
Author(s): Zhengxia Yang, Wenyu Yang, Institute of Semiconductors (China), Univ. of Chinese Academy of Sciences (China); Mengqi Wang, Xuliang Zhou, Institute of Semiconductors (China); Hongyan Yu, Yejin Zhang, Jiao-Qing Pan, Institute of Semiconductors (China), Univ. of Chinese Academy of Sciences (China)
On demand | Presented Live 11 October 2021
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For constructing functional photonic integrated circuits, it is expected to incorporate an efficient and compact laser source into the complementary metal-oxide-semiconductor (CMOS) platform. Monolithic integration of III-V sub-micron lasers grown on patterned SOI substrates by means of aspect ratio trapping method is a promising solution. Here, we have designed sub-micron lasers with reversed ridge waveguides on patterned Si/SOI substrates by 3D FDTD simulation, effectively confining the light into the submicron lasers without undercutting the underlying Si substrates. The reversed ridge waveguide structure can be formed by extending the III-V materials out of the trench. By optimizing the size of the structure, the optical leakage loss can be less than 1/cm. The high-quality InP reversed ridge waveguide epitaxial structures have been obtained. This provides a new approach to develop the silicon-based sub-micron lasers emitting at the telecom bands.
11890-13
Author(s): Nikita R. Poddubrovskii, Ivan A. Lobach, Sergei I. Kablukov, Institute of Automation and Electrometry of the SB (Russian Federation)
On demand
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This paper presents self-sweeping Er-doped ring fiber laser for the first time. Reverse self-sweeping in range of ~0.1 nm was obtained. Typical sweeping rate was 4 pm/s, which is significantly slower than in earlier reported fiber lasers. The laser generates long overlapping dual-mode pulses, frequency of each subsequent pulse increases by one inter-mode spacing. However, duration of dual-mode operation is ~10 ms, which is one order longer than in previous works. We demonstrated that increase in pump power causes deceleration of sweeping and elongation of pulses up to 500 ms. The developed source can be used for fiber sensors interrogation.
Break
Tea/Coffee Break 10:10 - 10:40
Session 4: Fiber/Solid Lasers II
In person: 11 October 2021 • 10:40 - 11:50 China Standard Time
Session Chair: Guoqiang Xie, Shanghai Jiao Tong Univ. (China)
11890-14
Author(s): Wenxue Li, Daping Luo, East China Normal Univ. (China)
In person: 11 October 2021 • 10:40 - 11:10 China Standard Time
11890-15
Author(s): Donglin Yan, Chao Guo, Pengfei Zhao, Rumao Tao, Qiang Shu, Honghuan Lin, Jianjun Wang, Ruoyu Liao, China Academy of Engineering Physics (China)
On demand | Presented Live 11 October 2021
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We proposed a simple O-shaped cylinder all-fiber-integrated laser without inter-cladding-power-strippers (CPS) based on a quasi-bidirectional pumping scheme. The fiber grooves were inscribed on the outside of an O-shaped aluminium cylinder with both straight and curved tracks. The curved track with a diameter of 10 cm could suppress the high order modes and keep a stable beam quality with the increases of output power, while the straight parts improve the robustness for fusion points and unpackaged optical components. The simplified configuration of no CPS between the oscillator and the amplifier could also improve the total efficiency. The output power, the optical-to-optical efficiency, the beam quality, and the Raman suppression are systematically investigated. It is verified that this design introduces a practical way to simultaneously improve the transverse mode instability (TMI) and SRS thresholds in a high-power fiber laser system with a simple configuration and high efficiency.
11890-16
Author(s): Shurong Jiang, Univ. of Electronic Science and Technology of China (China), Sichuan Univ. (China); Chen Wei, Le Zheng, Hongrong Zhou, Univ. of Electronic Science and Technology of China (China); Han Zhang, Jing Zhang, Sichuan Univ. (China); Yong Liu, Univ. of Electronic Science and Technology of China (China)
On demand | Presented Live 11 October 2021
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We demonstrate a dual-wavelength tunable passively Q-switched mid-infrared fiber laser at ~3 μm based on PtSe2. Stable pulses were achieved with a maximum average output power of 504.0 mW at 72.9 kHz repetition rate. The pulse width and pulse energy were 1.26 μs and 6.92 μJ, respectively. By tuning the feedback angle of the plane ruled grating, a simultaneous dual-wavelength operation with tuning range of 51.5 nm (2745.5-2797.0 nm) was observed at the launched pump of 2.27 W. This work confirms that PtSe2 is an excellent broadband saturable absorber for MIR spectral region.
11890-17
Author(s): Ji Won Kim, J. S. Park, E. J. Park, Y. J. Oh, Hanyang Univ. (Korea, Republic of); Hoon Jeong, Korea Institute of Industrial Technology (Korea, Republic of)
On demand
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We report experimental investigation of PD in Yb-doped fibers. From fluorescence spectra while pumping at 1018 nm and 976 nm, we can attribute the PD to existence of oxygen deficiency centers and its strong dependence on the excited Yb3+ ion density. Furthermore, we investigated the impact of PD on the laser amplification experiment, demonstrating that the tandem pumping at 1018 nm could dramatically reduce the PD-induced background loss compared to the LD pumping at 976 nm due to the low excited Yb3+ density. We will discuss the way to mitigate the PD in high power Yb fiber lasers.
Break
Lunch Break 11:50 - 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
11890-35
Author(s): Xianzhong Zhang, Kai Zhong, Hongzhan Qiao, Yizhe Zheng, Fangjie Li, Degang Xu, Jianquan Yao, Tianjin Univ. (China)
On demand | Presented Live 11 October 2021
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A continuous-wave (CW) dual-wavelength laser with coaxial diode end-pumping configuration is demonstrated. A theoretical model was built to simulate the CW output power process of the dual-wavelength laser generation. The experiment was performed with Nd:YVO4/Nd:YAP composite laser crystals. The continuous-wave output power reached 5.28 W under the maximum LD pump power of 15 W, corresponding to optical-to-optical conversion efficiencies of 35.2%. The power ratio between 1064.6 nm and 1080 nm could be tuned by varying the pump wavelength to balance the gains in two laser crystals.
11890-36
Author(s): Siping Lian, Jiahao Guo, Guangxi Normal Univ. (China); Yongzhang Chen, Shenzhen Technology Univ. (China); Jinchao Deng, Shenzhen Univ. (China); Yongqin Yu, Dezhi Liang, Yufeng Zhang, Shenzhen Technology Univ. (China); Haibing Xiao, Shenzhen Institute of Information Technology (China); Chenlin Du, Shenzhen Technology Univ. (China); Junhui Hu, Guangxi Normal Univ. (China)
On demand | Presented Live 11 October 2021
11890-37
Author(s): Peng Wang, Baolai Yang, Hanwei Zhang, Xiaoming Xi, Chen Shi, Xiaolin Wang, Xiaojun Xu, National Univ. of Defense Technology (China)
On demand | Presented Live 11 October 2021
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A high-power fiber laser oscillator with ring beam output was demonstrated using bidirectional-pumping scheme. It was able to deliver ring-beam laser when the output power was higher than 2 kW and the intensity distribution was very uniform. The power fluctuation was just 0.4% during the 1h continuous working period. The temperature of all parts in the oscillator was relatively low and safety.
11890-38
Author(s): Zhenhua Shao, Fudan Univ. (China); Xuanxi Li, Jiangsu Normal Univ. (China); Manman Ding, Fudan Univ. (China); Deyuan Shen, Jiangsu Normal Univ. (China); Heyuan Zhu, Fudan Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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We present the first demonstration, to our knowledge, the mid-infrared diamond Raman laser emitting at 2.91 μm pumped by a narrow linewidth Q-switched Ho:YAG laser at 2.09 μm. The Raman laser, which utilized a 5.1-mm-long, Brewster angle cut synthetic crystal diamond with external cavity pumping, the output energy up to 40 μJ is generated with a slope efficiency of 5%, and the corresponding to the peak power of 1.47 kW. The numerical modelling shows that to reduce the impact of the three-phonon absorption at 2.91 μm and obtain the higher conversion efficiency, it is necessary to increasing the output coupling of the cavity. By optimizing the length of diamond and output coupling of cavity, it is predicted that the conversion efficiency of 18% can be obtained.
11890-39
Author(s): Degang Xu, Jiaxin Zhang, Yuye Wang, Tianjin Univ. (China); Jiyong Yao, Yangwu Guo, Technical Institute of Physics and Chemistry (China); Kai Chen, Chao Yan, Jianquan Yao, Tianjin Univ. (China)
On demand | Presented Live 11 October 2021
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We have demonstrated a high energy, widely tunable, long-wave mid-infrared optical parametric oscillator based on BaGa4Se7 crystal (BaGa4Se7-OPO) which was pumped by an economical wavelength of 1.064μm. The BaGa4Se7-OPO was designed as a double pass single resonant oscillator (DP-SRO), with the advantages of low threshold and high output. The output energy and conversion efficiency of BaGa4Se7-OPO with different cavity lengths were studied theoretically and experimentally. The maximum mid-infrared energy of 611μJ/pulse at 11μm was obtained, and the corresponding optical-to-optical conversion efficiency was 1.53%. A wide tuning range of 8.24-13.3μm was achieved by rotating the BaGa4Se7 crystal and it can be well matched with the theoretical calculation.
11890-40
Author(s): Jiahao Zeng, Xianlin Song, Nanchang Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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This paper uses the finite element software COMSOL Multiphysics to research the relationship between ultrashort laser pulses and the generated photoacoustic signals. In COMSOL, three lasers with different pulse widths of 10ns, 10ps, and 100fs are used as excitation light sources. The four modules of light transmission, biological heat transfer, solid mechanics and pressure acoustics are used to simulate the photoacoustic imaging processes of the photothermal conversion-thermal expansion-generating ultrasound of the tumor in the stomach tissue. In this way, the photoacoustic signal and its image are obtained. Finally, compare the images obtained through simulation. The simulation results show that laser excitation with ultra-short pulse width can obtain a photoacoustic signal with a wider spectrum range (picoseconds up to GHz) and a higher signal-to-noise ratio.
11890-41
Author(s): Qi Kuang, Shanghai Univ. (China), Shanghai Institute of Optics and Fine Mechanics (China); Xiong Shen, Shanghai Institute of Optics and Fine Mechanics (China), Ctr. of Materials Science and Optoelectronics Engg, Univ. of Chinese Academy of Science (China); Lihua Bai, Shanghai Univ. (China); Jun Liu, Shanghai Institute of Optics and Fine Mechanics (China), Ctr. of Materials Science and Optoelectronics Engg, Univ. of Chinese Academy of Science (China)
On demand | Presented Live 11 October 2021
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Full characterization of few-cycle laser pulses is necessary for laser application. FROG is one of the most widely used full characterization techniques so far, and SRSI is another fresh one with attractive capacity. An all-reflective transient-grating based self-referenced spectral interferometry (AR-TG-SRSI) method is proposed for the single-shot characterization of few-cycle near Fourier transform-limited (FTL) laser pulses with a spectral range from UV to mid-IR. What’s more, a simple device FASI is built, which combines the FROG method and the SRSI method based on the same third-order TG effect in a single device. Pulses centered at 800 nm and 1800 nm were characterized by these two devices to verify their capacity. The two devices can characterize few-cycle pulses with a broad spectral range. And can characterize pulse by using the SRSI mode for well-compressed pulses. While, for complete pulses that own large chirp, the TG-FROG mode of the FASI device can also do the work.
11890-42
Author(s): Shuman Du, Xiong Shen, Wenhai Liang, Peng Wang, Jun Liu, Shanghai Institute of Optics and Fine Mechanics (China)
On demand | Presented Live 11 October 2021
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Recently, a new limitation from traditional grating-based pulse compressor appeared during achieve high-energy tens and hundreds PW laser pulses because the damage threshold and maximum size of diffraction gratings are not high or large enough to satisfy the requirement. Here, we propose feasible grating-based pulse compressors that can compress high-energy 100 PW laser pulse with a single beam. It contains two schemes, one is multistep pulse compressor that including pre-compressor, main compressor and post compressor, while the other is asymmetric four-grating compressor that replaces the pre-compressor and main compressor. The proposed novel grating-based pulse compressors increase the maximum bearable input and output pulse energies through modifying their spatiotemporal properties, and the introduced smoothing beam with spatial dispersion can be automatically compensated at the focal plane by using the spatiotemporal focusing technique.
11890-43
Author(s): Jin Qian, Xiaobo Liu, NARI Group Corporation (State Grid Electric Power Research Institute) (China); Xianglian Yan, China Electric Power Research Institute (China); Qiang Yao, State Grid Chongqing Electric Power Research Institute (China); Shukai He, Henan Relations Co. (China); Shiling Zhang, State Grid Chongqing Electric Power Research Institute (China); Rubin Qi, Xintian Li, Henan Relations Co. (China); Xiao-zhe Zeng, Henan Relations Co., Ltd. (China); Xinghui Wang, Jigang Zi, Yunqi Yue, Henan Relations Co. (China)
On demand | Presented Live 11 October 2021
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The detection system of SO2F2 gas in GIS was built based on the second harmonic absorption technology by using an interband cascade laser with a central wavelength of 3599 nm. Experimental results of the tuning characteristics of the ICL laser show that when the laser works at 35℃ and the driving current is 60-100mA, the emission wavelength of the laser output can cover the range of 3615.4 nm to 3623.37 nm, which meets the detection requirements of SO2F2 gas at 3619.3 nm. The second harmonic detection results show that the harmonic absorption intensity of gas increases with the increase of gas concentration, and the fitting linear correlation R2 is 0.99563, which has a good positive correlation.This method can provide a new method for optical detection of SO2F2 gas.
11890-44
Author(s): Hua Liu, Luoyang Electro-optical Equipment Research Institute (China); Quanxin Ding, Science and Technology on Electro-optic Control Laboratory, China (China); Mingsuo LI, Ronggang ZHU, Science and Technology on Electro-optic Control Laboratory (China)
On demand | Presented Live 11 October 2021
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For aim to establish a high-precision sensor system configuration, this paper presents a new approach to the software architecture to enhance the multidisciplinary design frame that facilitates the reuse of existing components, the addition new ones, and the scripting of multidisciplinary optimization procedures. Firstly, some strategies applied to implement the necessary components of a high-precision optoelectronic structural design environment for complete sensor system configurations, and demonstrate the advantages with different parts studied, that is optical system module, electronic module, control module, and the relationship among these correlative components. At the core of the configuration is a core photonics to define the system function and role to give solutions to external users, and three so that more than three subjects will be applied cooperative.
11890-45
Author(s): Alexey G. Kuznetsov, Sergey I. Kablukov, Sergey A. Babin, Institute of Automation and Electrometry of the SB (Russian Federation)
On demand
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Raman lasing in 3.7-km multimode graded-index 62.5/125 fiber pumped by high-power CW 976-nm laser diode is converted into pulsed regime by means of fiber pigtailed intra-cavity acousto-optic modulator. At 27.19-kHz repetition rate corresponding to the round-trip frequency, stable nanosecond pulses at the 1st (1018 nm) and 2nd (1064 nm) Stokes orders are obtained. At that, the beam quality of generated pulses is greatly improved as compared to that for pump diode reaching M2~3 for the 1st order and even better for 2nd order. Features of the mode-locking regime in multimode fiber Raman laser and mechanisms of beam cleaning are treated.
11890-46
Author(s): Denis S. Kharenko, Institute of Automation and Electrometry of the SB (Russian Federation), Novosibirsk State Univ. (Russian Federation); Mikhail D. Gervaziev, Novosibirsk State Univ. (Russian Federation), Institute of Automation and Electrometry of the SB (Russian Federation); Alexey Kuznetsov, Institute of Automation and Electrometry of the SB (Russian Federation); Stefan Wabnitz, Novosibirsk State Univ. (Russian Federation), Sapienza Univ. di Roma (Italy); Evgeniy V. Podivilov, Sergey A. Babin, Institute of Automation and Electrometry of the SB (Russian Federation), Novosibirsk State Univ. (Russian Federation)
On demand
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All-fiber Raman lasers have demonstrated their potential for the efficient conversion of highly multimode pump beams into a high-quality Stokes beams. However, the modal content of these beams has not been investigated yet. Here we apply, for the first time, a mode decomposition technique for revealing intermodal interactions in different operational regimes of CW multimode Raman lasers. Our approach allows for analyzing the output laser radiation in terms of the amplitude and phase distributions of a huge number of excited modes for both the pump and the Stokes beams, which enables a new insight into nonlinear mode coupling processes. The measured contribution of the first three modes of the residual pump beam after overcoming the SRS threshold decreased on average by 25%, whereas the signal beam mainly consists of fundamental mode (40%) and the modes of the first group (20%).
Session 5: GaS Lasers and Others
In person: 11 October 2021 • 14:30 - 16:20 China Standard Time
Session Chairs: Ji Won Kim, Hanyang Univ. (Korea, Republic of), Huailiang Xu, Jilin Univ. (China)
11890-18
Author(s): Huailiang Xu, Jilin Univ. (China)
In person: 11 October 2021 • 14:30 - 15:00 China Standard Time
11890-19
Author(s): You Wang, Guofei An, Jiao Yang, Jiawei Guo, Qing Luo, Hongyuan Wang, Feng Yang, Southwest Institute of Technical Physics (China)
In person: 11 October 2021 • 15:00 - 15:20 China Standard Time
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A diode pumped alkali laser (DPAL) provides a significant potential for construction of high-powered lasers. To realize the scaling of a DPAL, heat management should be optimized. In this paper, a new kind of gas-flowing DPAL was proposed, in which a small cross-flow fan with diameter of 70 mm was set in the center of a cylindrical vapor cell whose diameter is 100 mm. The gain medium of cesium and the buffer gas of ethane were filled in the vapor cell with the total pressure is about 1 atmosphere. A mathematical model was constructed to systematically study the influence of the rotate speed and the heating temperature on the internal temperature distribution and the output features of the laser. In addition, the corresponding verified experiment was carried out. The experimental results were in good agreement with the theoretical simulations.
11890-20
Author(s): Xianlin Song, Ao Teng, Nanchang Univ. (China)
In person: 11 October 2021 • 15:20 - 15:40 China Standard Time
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The interaction between micro-ring resonator and photoacoustic signal of human brain was simulated and analyzed by COMSOL Multiphysics. The photoacoustic signal of human brain obtained in COMSOL acted on the micro-ring to produce weak deformation of the micro-ring, which would change the wavelength of the resonant peak. Through the movement of the resonant peak, the difference of photoacoustic signal in different positions of biological tissues can be deduced, and then the spatial distribution of laser absorption characteristics of biological tissues can also be obtained. This study provides theoretical guidance for the practical application of micro-ring resonators in photoacoustic imaging of human brain.
11890-21
Author(s): Jiao Yang, Guofei An, Jiawei Guo, Qing Luo, He Cai, Hongyuan Wang, Feng Yang, You Wang, Southwest Institute of Technical Physics (China)
On demand | Presented Live 11 October 2021
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In this paper, the laser kinetic, steady state heat transfer, and computational fluid dynamics are coupled together to construct a theoretical model for a gas flowing diode pumped cesium laser system. The co-simulation method is introduced into the simulation model to solve the problem that a conventional commercial FEM based analysis soft cannot simulate the laser kinetic of a FDPAL system. The results show that the inlet velocity should be higher than 8 m/s for a kW level tubular FDPCL system. The pressure of helium contributes to decrease the output power and temperature gradient. The pressure of ethane is good for the improvement of output power, and bad for decrease of temperature gradient of an alkali vapor cell.
11890-22
Author(s): Guorui Zhou, Siheng Xiang, Longfei Niu, Yilan Jiang, Xinxiang Miao, China Academy of Engineering Physics (China)
In person: 11 October 2021 • 16:00 - 16:20 China Standard Time
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Airborne Molecular Contaminants (AMCs) affect the performance of optics in high power lasers (HPLs). In the work we demonstrate the on-line monitoring method of AMCs concentration based on Sagnac microfiber structure.The proposed sensor can reduce the operation and time cost of HPLs, and extend its application to semiconductor field. Given the advantages such as compact size,easy fabrication and low cost, the proposed Sagnac microfiber structure is also competent for environment monitoring.
11890-23
Author(s): Zhifeng Zhang, Xingdu Qiao, Bikashkali Midya, Kevin Liu, Haoqi Zhao, Univ. of Pennsylvania (United States); Jingbo Sun, Duke Univ. (United States); Tianwei Wu, Univ. of Pennsylvania (United States); Danilo Pires, Duke Univ. (United States); Wenjing Liu, Zihe Gao, Ritesh Agarwal, Univ. of Pennsylvania (United States); Josep Jornet, Northeastern Univ. (United States); Stefano Longhi, Politecnico di Milano (Italy), Instituto de Fisica Interdisciplinar y Sistemas Complejos (Spain); Natalia Litchinitser, Duke Univ. (United States); Liang Feng, Univ. of Pennsylvania (United States)
On demand
Session 6: Fiber/Solid Lasers III
In person: 12 October 2021 • 08:50 - 10:00 China Standard Time
Session Chair: Fengqiu Wang, Nanjing Univ. (China)
11890-25
Author(s): Minglie Hu, Tianjin Univ. (China)
In person: 12 October 2021 • 08:50 - 09:20 China Standard Time
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A brief review of recent work on high power femtosecond fiber laser are demonstrated. The reposrt shows that few cycle laser pulses can be obtained by optimization of nonlinear process in fiber laser system.
11890-27
Author(s): Xiao Chen, Liangjin Huang, Huan Yang, Xiaoming Xi, Yi An, Zhiping Yan, Zhiyong Pan, Pu Zhou, National Univ. of Defense Technology (China)
In person: 12 October 2021 • 09:20 - 09:40 China Standard Time
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We theoretically and experimentally reveals a modified structure of all-solid photonic bandgap fiber, in which part of high-index nodes were replaced by silica to generate multi-resonance and bending induced high-order-modes leakage. With the structural parameters designed in the 3rd photonic bandgap, the hexagon core of the fabricated fiber was measured to be 46 μm in corner-to-corner direction, corresponding to a mode field diameter around 30 μm at 1080 nm. The transmission spectrum exhibited a broad bandwidth for nearly 200 nm around 1 µm. Bending loss lower than 0.1dB/m of a 5-m-length fiber was obtained in case of bending radius R > 25 cm. In addition, the wavelength dependence of beam quality factor M2 was predicted and verified. By employing the spatially and spectrally resolved imaging method, a robust single-mode performance of the fabricated fiber was demonstrated with integrated multipath interferences to be lower than -47 dB in different wavelength ranges.
11890-28
Author(s): Weiwei Huang, Fei Wang, Deyuan Shen, Jun Wang, Dingyuan Tang, Jiangsu Normal Univ. (China)
On demand | Presented Live 12 October 2021
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We report on high power and efficient laser operation of low scattering loss Tm:Y2O3 ceramic fabricated in house via co-precipitation process. The Tm3+ ion is pumped directly to the upper energy level of the ~ 2 μm laser transition (3F4 → 3H6) using a high power 1620 nm fiber Raman laser. With an optically polished but uncoated sample of 2 at.% doping, the laser generated 11.3 W of TEM00 output power at ~2050 nm for ~19 W of absorbed pump power, corresponding to a slope efficiency of 74.4% with respect to absorbed pump power.
Break
Tea/Coffee Break 10:00 - 10:20
Session 7: Fiber/Solid Lasers IV
In person: 12 October 2021 • 10:20 - 12:10 China Standard Time
Session Chair: Xueming Liu, Zhejiang Univ. (China)
11890-29
Author(s): Fengqiu Wang, Nanjing Univ. (China)
In person: 12 October 2021 • 10:20 - 10:50 China Standard Time
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There is tremendous technological needs for compact and efficient pulsed lasers operating in the mid-infrared range. While recent advances in mid-infrared gain platforms (including QCLs and mid-infrared rare earth doped fibers) are exciting, the lack of a capable optical switching device in the MIR has significantly limited the field. Following great efforts in low-dimensional materials, such as graphene and carbon nanotubes, we have recently identified a new class of quantum material –Topological Dirac Semimetal- which show promise for mid-infrared optical switching devices. The material shows good absorption as well as excellent tunability in key optical characteristics in the MIR, and can be fabricated into SESAM devices that greatly facilitates mass processing.
11890-30
Author(s): Manman Ding, Fudan Univ. (China); Xuanxi Li, Jun Wang, Dingyuan Tang, Jiangsu Normal Univ. (China); Deyuan Shen, Jiangsu Normal Univ. (China), Jiangsu Institute of Mid Infrared Laser Technology & Applications (China); Heyuan Zhu, Fudan Univ. (China)
In person: 12 October 2021 • 10:50 - 11:10 China Standard Time
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Lasing performances of Er:Y2O3 ceramics at ~2.7 μm (4I11/2→ 4I13/2 transition) prepared by the co-precipitation process and the solid-state reaction method are investigated and compared. The laser experiments are carried out with identical conditions in terms of resonator design, ceramic cooling, and pump conditions for comparison. The pump source is a fiber-coupled high power and narrow linewidth 976 nm laser diode wavelength locked with a VBG. Using a simple plane-plane laser resonator design and output coupler of 10% transmission, better lasing performance in terms of lasing efficiency and output power level has been achieved using the co-precipitation process prepared ceramic samples. Output power up to 10.2 W has been generated with the absorbed power of ~67 W, corresponding to a slope efficiency of 16.3% with respect to the absorbed pump power. In a modified resonator design, lasing slope efficiencies of up to 22.6% have been measured.
11890-31
Author(s): Yizhe Zheng, Kai Zhong, Kefei Liu, Hongzhan Qiao, Xianzhong Zhang, Degang Xu, Jianquan Yao, Tianjin Univ. (China)
On demand | Presented Live 12 October 2021
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Considering the impact of the pump focal position on the performance of dual-wavelength lasers with coaxially arranged dual crystals, the thermal effects based on two coaxial Nd:YVO4 crystals with variable pump focal position and incident pump power were studied. The output characteristics and thermal focal lengths were discussed at different cavity lengths using the resonator theories. We also researched the performance of the scheme with two discrete crystals when the focusing position locates deep into the crystals at different cavity lengths and the advantages over a monolithic crystal were verified.
11890-32
Author(s): Le Zheng, Chen Wei, Univ. of Electronic Science and Technology of China (China); Shurong Jiang, Sichuan Univ. (China); Hongrong Zhou, Univ. of Electronic Science And Technology of China (China); Sun Fanxi, Wang Dongsheng, Yong Liu, Univ. of Electronic Science and Technology of China (China)
On demand | Presented Live 12 October 2021
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We report Q-switched Er3+-doped ZBLAN fiber lasers operating at 2.8 μm based on MIL-68(Al) (MIL: Materials of Institute Lavoisier), for the first time. The nonlinear absorption of MIL-68(Al) was characterized by using a homemade nonlinear absorption measurement system. The modulation depth, non-saturable loss, and saturation peak intensity are determined to be 24.43 %, 58.63%, and 0.0335 GW/cm2, respectively. A piece of 6 mol.% multimode Er3+-doped ZBLAN fiber was used as the gain medium. The maximum average output power as high as 1.18 W was reached with the shortest pulse duration as short as 546 ns at a repetition rate of 106.71 kHz. The corresponding pulse energy and peak power were 11.03 J and 20.19 W, respectively. Then, we replaced the gain fiber with a 7 mol.% single-mode Er3+-doped ZBLAN fiber and achieved nanosecond pulses with a pulse duration of 846 ns and average output power of 0.734 W. The corresponding pulse energy and peak power were 3.68 J and 4.25 W, respectively.
11890-33
Author(s): Shurong Jiang, Sichuan Univ. (China), Univ. of Electronic Science and Technology of China (China); Chen Wei, Univ. of Electronic Science and Technology of China (China); Le Zheng, Hongrong Zhou, Univ. of Electronic Science and Technology of China (China); Han Zhang, Jing Zhang, Sichuan Univ. (China); Yong Liu, Univ. of Electronic Science and Technology of China (China)
In person: 12 October 2021 • 11:50 - 12:10 China Standard Time
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In this work, we utilized a pulsed 976 nm laser system combined with a home-made continuous-wave 1973 nm laser as the pump sources to achieve pulse output at 3.5 μm from Er3+-doped ZBLAN fiber, which is the first demonstration of the modulation potential of 976 nm pulses in this cascade pump system, to the best of our knowledge. Stable pulses were obtained with repetition rates ranging between 5 kHz and 10 kHz. The maximum output power of 500.4 mW was achieved at 10 kHz with a wavelength of 3445.9 nm. The temporal profile of the pulse trains was characterized by stable relaxation spike pulses containing a series of sub-pulses. The underlying mechanism is discussed. This work makes an effort to better understand the dynamics and theory of the cascade pumping system, and provides a new perspective for the realization of high-power pulses beyond 3 μm band.
11890-34
Author(s): Roman V. Drobyshev, Institute of Automation and Electrometry of the SB (Russian Federation); Nikita R. Poddubrovskii, Institute of Automation and Electrometry of the SB (Russian Federation), Novosibirsk State Univ. (Russian Federation); Ivan A. Lobach, Sergey I. Kablukov, Institute of Automation and Electrometry of the SB (Russian Federation)
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In this work, a self-sweeping Yb-doped fiber laser generating quasi-CW radiation is demonstrated. The laser is based on a ring configuration allowing to form running and standing waves in separate sections of the cavity. The laser generates a sequence of single-frequency (linewidth of ~0.7 MHz) ultra long (~1 ms) rectangular pulses. The laser frequency changes from pulse to pulse by one inter-mode spacing (~10 MHz). The laser signal intensity is quasi-CW signal accompanied by regular bursts generating during frequency change, and the intensity never drops to zero. The features can be useful for long term averaging when measuring weak signals.
Conference Chair
AdValue Photonics, Inc. (United States)
Conference Chair
Deutsches Elektronen-Synchrotron (Germany)
Conference Chair
Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences (China)
Program Committee
BohnLaser Consult (Germany)
Program Committee
Institute of Physics, Chinese Academy of Sciences (China)
Program Committee
Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences (China)
Program Committee
Mali Gong
Tsinghua Univ. (China)
Program Committee
Gwangju Institute of Science and Technology (Korea, Republic of)
Program Committee
Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences (China)
Program Committee
Zhejiang Univ. (China)
Program Committee
Zejin Liu
National Univ. of Defense Technology (China)
Program Committee
Deyuan Shen
Fudan Univ. (China)
Program Committee
NASA Langley Research Ctr. (United States)
Program Committee
Shenzhen Univ. (China)
Program Committee
Zuyan Xu
Technical Institute of Physics and Chemistry, Chinese Academy of Sciences (China)
Program Committee
Tianjin Univ. (China)
Program Committee
Korea Univ. (Korea, Republic of)
Program Committee
NASA Langley Research Ctr. (United States)
Program Committee
East China Normal Univ. (China)
Program Committee
Xiaomin Zhang
China Academy of Engineering Physics (China)
Program Committee
Sichuan Univ. (China)
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