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9 October 2018 A pressure-tuned field-widened Michelson interferometer system as the spectroscopic filter of high-spectral-resolution lidar
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Abstract
The spectroscopic filter plays a critical role in an HSRL (high-spectral-resolution lidar) system. In this paper, a pressuretuned field-widened Michelson interferometer (PT FWMI for short) is proposed. The design of the pressure tuning and the field widening of the PT FWMI are addressed in detail, and the development of a laboratory demonstrator is described as well. The optical elements contain a solid arm made of the glass H-ZF52 with the dimension of 59.572 mm, and an air gap with the length of 32.889 mm within the sealed chamber of 1 atm. Due to the matched dimensions and refractive indices of the two arms, the experimental testing results show that the OPD variation of the developed PT FWMI is about 0.13 lambda and the RMS is less than 0.03 lambda when the divergent angle is as much as 3 degree (half angle). The filtering performance of the prototype developed is scanned with a frequency tunable laser whose bandwidth is 10MHz. Results revealed that bright to dark fringe contrast of the spectroscopic filter is approximately 33. In conclusion, this newly proposed pressure tuning design is suitable for developing stable and tunable FWMI spectroscopic filters and paves the way for designing a robust near infrared HSRL system.
Conference Presentation
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Xue Shen, Dong Liu, Nanchao Wang, Yibing Shen, Jian Bai, and Qun Liu "A pressure-tuned field-widened Michelson interferometer system as the spectroscopic filter of high-spectral-resolution lidar", Proc. SPIE 10791, Lidar Technologies, Techniques, and Measurements for Atmospheric Remote Sensing XIV, 107910E (9 October 2018); https://doi.org/10.1117/12.2325297
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