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Proceedings Paper

Tilted pressure-tuned field-widened Michelson interferometer for high spectral resolution lidar
Author(s): Dong Liu; Chris Hostetler; Ian Miller; Anthony Cook; Richard Hare; David Harper; Jonathan Hair
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Paper Abstract

High spectral resolution lidars (HSRLs) designed for aerosol and cloud remote sensing are increasingly being deployed on aircraft and called for on future space-based missions. The HSRL technique relies on spectral discrimination of the atmospheric backscatter signals to enable independent, unambiguous retrieval of aerosol extinction and backscatter. NASA Langley Research Center is developing a tilted pressure-tuned field-widened Michelson interferometer (FWMI) to achieve the spectral discrimination for an HSRL system. The FWMI consists of a cubic beam splitter, a solid glass arm, and a sealed air arm. The spacer that connects the air arm mirror to the main part of the interferometer is designed to minimize thermal sensitivity. The pressure of the sealed air-arm air can be accurately controlled such that the frequency of maximum interference can be tuned with great precision to the transmitted laser wavelength. In this paper, the principle of the tilted pressure-tuned FWMI for HSRL is presented. The pressure tuning rate, the tilted angle requirement and challenges in building the real instrument are discussed.

Paper Details

Date Published: 9 May 2012
PDF: 7 pages
Proc. SPIE 8439, Optical Sensing and Detection II, 84390P (9 May 2012); doi: 10.1117/12.922022
Show Author Affiliations
Dong Liu, NASA Langley Research Ctr. (United States)
Chris Hostetler, NASA Langley Research Ctr. (United States)
Ian Miller, LightMachinery Inc. (Canada)
Anthony Cook, NASA Langley Research Ctr. (United States)
Richard Hare, NASA Langley Research Ctr. (United States)
David Harper, NASA Langley Research Ctr. (United States)
Jonathan Hair, NASA Langley Research Ctr. (United States)

Published in SPIE Proceedings Vol. 8439:
Optical Sensing and Detection II
Francis Berghmans; Anna Grazia Mignani; Piet De Moor, Editor(s)

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