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Proceedings Paper

Field-widened Michelson interferometer system as the spectroscopic filter of high-spectral-resolution lidar
Author(s): Zhongtao Cheng; Dong Liu; Yudi Zhou; Yongying Yang; Yupeng Zhang; Jing Luo; Jian Bai; Chong Liu; Yibing Shen
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Paper Abstract

We propose and develop a field-widened Michelson interferometer (FWMI) system to act as a new type of spectroscopic filter in HSRL application. Due to the field widening characteristic, the FWMI can allow relatively large off-axis incident angle, and can be designed to any desirable wavelength. The theoretical foundations of the FWMI are introduced in this paper, and the developed prototype interferometer is described. It consists of a solid arm made of the glass H-ZF52 with the dimension of 37.876 mm, and an air gap with the length of 20.382 mm. These two interference arms are connected to a cube beam splitter to constitute a Michelson interferometer. Due to the matched dimensions and refractive indices of the two arms, the experimental testing results show that the OPD variation of the developed FWMI is about 0.04 lambda and the RMS is less than 0.008 lambda when the incident angle is as much as 1.5 degree (half angle). The cumulative wavefront distortion caused by the FWMI is less than 0.1 lambda PV value and 0.02 lambda RMS value. To lock the filtering frequency of the FWMI to the laser transmitter, a frequency locking system, which is actually an electro-optic feedback loop, is established. The setup and principle of this frequency locking system are also described in detail. Good locking accuracy of the FWMI about 27MHz is demonstrated through the frequency locking technique. All these results validate the feasibility of this developed FWMI system as a spectroscopic filter of an HSRL.

Paper Details

Date Published: 13 May 2016
PDF: 7 pages
Proc. SPIE 9832, Laser Radar Technology and Applications XXI, 98320Y (13 May 2016); doi: 10.1117/12.2223715
Show Author Affiliations
Zhongtao Cheng, Zhejiang Univ. (China)
Dong Liu, Zhejiang Univ. (China)
Yudi Zhou, Zhejiang Univ. (China)
Yongying Yang, Zhejiang Univ. (China)
Yupeng Zhang, Zhejiang Univ. (China)
Jing Luo, Zhejiang Univ. (China)
Jian Bai, Zhejiang Univ. (China)
Chong Liu, Zhejiang Univ. (China)
Yibing Shen, Zhejiang Univ. (China)

Published in SPIE Proceedings Vol. 9832:
Laser Radar Technology and Applications XXI
Monte D. Turner; Gary W. Kamerman, Editor(s)

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