Spatial heterodyne spectroscopy for long-wave infrared: optical design and laboratory performance

Bin Han; Yutao Feng; Zhaohui Zhang; Qinglan Bai; Junqiang Wu; Yang Wu; Chenguang Chang; Jian Sun

doi:10.1117/12.2580379

5 November 2020 Spatial heterodyne spectroscopy for long-wave infrared: optical design and laboratory performance

Bin Han, Yutao Feng, Zhaohui Zhang, Qinglan Bai, Junqiang Wu, Yang Wu, Chenguang Chang, Jian Sun

Proceedings Volume 11566, AOPC 2020: Optical Spectroscopy and Imaging; and Biomedical Optics; 115660Q (2020) https://doi.org/10.1117/12.2580379
Event: Applied Optics and Photonics China (AOPC 2020), 2020, Beijing, China

Abstract

Spatial heterodyne spectroscopy for long-wave infrared identifies an ozone line near 1133 cm^-1 (about 8.8 μm) as a suitable target line, the Doppler shifts of which are used to retrieve stratosphere wind and ozone concentration. The basic principle of Spatial Heterodyne Spectroscopy (SHS) is elaborated. Theoretical analyses for the optical parameters of spatial heterodyne spectroscopy are deduced. The optical system is designed to work at 160 K and to maximize the field of view (FOV). The optical design and simulation is carried on to fulfill the requirement. The principle prototype was built and a frequency-stable laser was used to conduct the experiment. Result shows that the designed interferometer can meet the requirement of spectral resolution (0.1 cm^-1 ) and that the spatial frequency of fringe pattern is consistent with the theoretical value at normal temperature and pressure.

Citation Download Citation

Bin Han, Yutao Feng, Zhaohui Zhang, Qinglan Bai, Junqiang Wu, Yang Wu, Chenguang Chang, and Jian Sun "Spatial heterodyne spectroscopy for long-wave infrared: optical design and laboratory performance", Proc. SPIE 11566, AOPC 2020: Optical Spectroscopy and Imaging; and Biomedical Optics, 115660Q (5 November 2020); https://doi.org/10.1117/12.2580379

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KEYWORDS

Interferometers

Infrared radiation

Infrared spectroscopy

Long wavelength infrared

Prisms

Beam splitters

Optical design

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