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13 September 2011 Modeling of a tilted pressure-tuned field-widened Michelson interferometer for application in high spectral resolution lidar
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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. A compact, monolithic field-widened Michelson interferometer is being developed as the spectral discrimination filter for an HSRL system at NASA Langley Research Center. The Michelson interferometer consists of a cubic beam splitter, a solid glass arm, and an air arm. The spacer that connects the air arm mirror to the main part of the interferometer is designed to optimize thermal compensation such that the frequency of maximum interference can be tuned with great precision to the transmitted laser wavelength. In this paper, a comprehensive radiometric model for the field-widened Michelson interferometeric spectral filter is presented. The model incorporates the angular distribution and finite cross sectional area of the light source, reflectance of all surfaces, loss of absorption, and lack of parallelism between the airarm and solid arm, etc. The model can be used to assess the performance of the interferometer and thus it is a useful tool to evaluate performance budgets and to set optical specifications for new designs of the same basic interferometer type.
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Dong Liu, Chris Hostetler, Ian Miller, Anthony Cook, and Jonathan Hair "Modeling of a tilted pressure-tuned field-widened Michelson interferometer for application in high spectral resolution lidar", Proc. SPIE 8159, Lidar Remote Sensing for Environmental Monitoring XII, 81590Q (13 September 2011); https://doi.org/10.1117/12.899406
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