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Proceedings Paper

Development of a field-widened Michelson spectroscopic filter for a polarized near-infrared high spectral resolution lidar
Author(s): Dong Liu; Yongying Yang; Zhongtao Cheng; Tong Ling; Hanlu Huang; Yudi Zhou; Qiaoshuang Zhang; Bo Zhang; Yibing Shen
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Paper Abstract

Standard backscatter lidars encounter problems when solving the two unknowns (aerosol backscatter coefficient and extinction coefficient) from the only one recorded lidar equation. With the help of the high-spectral-resolution filter, high spectral resolution lidars (HSRLs) can provide unambiguous retrieval without critical assumptions. Spectral discrimination between scattering from molecules and aerosols or cloud particles is the basis of the HSRL technique, and several lidar approaches have been developed to obtain this discrimination. Iodine cell filter, which is a kind of atomic/molecular absorption filter, is robust, stable, and can achieve very good separation of aerosol Mie scattering from atmosphere molecular Cabannes scattering. However, absorption filters are lossy and gaseous absorption lines do not exist at many convenient laser wavelengths. Fabry-Perot interferometers are simple and can be tuned to any wavelength, but are limited by acceptance angle. Field-widened Michelson interferometer (FWMI) is considered to have the ability to overcome the deficiencies of the aforementioned filters as it can perform well at relatively large off-axis angles, is nearly lossless, and can be built to any wavelength. In this paper, the development process of an FWMI that is introduced to be the spectroscopic filter for a polarized near-infrared HSRL instrument will be present. The retrieval process of the aerosol optical properties, the design requirements with special focus on the selection of the free spectral range (FSR) of the FWMI, as well as the design result will be described in detail.

Paper Details

Date Published: 17 September 2013
PDF: 12 pages
Proc. SPIE 8872, Lidar Remote Sensing for Environmental Monitoring XIV, 88720L (17 September 2013); doi: 10.1117/12.2022952
Show Author Affiliations
Dong Liu, Zhejiang Univ. (China)
Yongying Yang, Zhejiang Univ. (China)
Zhongtao Cheng, Zhejiang Univ. (China)
Tong Ling, Zhejiang Univ. (China)
Hanlu Huang, Zhejiang Univ. (China)
Yudi Zhou, Zhejiang Univ. (China)
Qiaoshuang Zhang, Zhejiang Univ. (China)
Bo Zhang, Zhejiang Univ. (China)
Yibing Shen, Zhejiang Univ. (China)

Published in SPIE Proceedings Vol. 8872:
Lidar Remote Sensing for Environmental Monitoring XIV
Upendra N. Singh, Editor(s)

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