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Optical Engineering

Infrared phototransistor validation for atmospheric remote sensing application using the Raman-shifted eye-safe aerosol lidar
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Paper Abstract

An InGaAsSb/AlGaAsSb phototransistor has been validated for lidar atmospheric remote sensing. The validation was performed using the Raman-shifted eye-safe aerosol lidar (REAL) at the National Center for Atmospheric Research. Although the device is optimized for detection around the 2-μm wavelength, the validation was performed at 1.543 μm, where mature commercial detectors are available. Simultaneous measurement of the atmospheric backscatter signals using the custom-built phototransistor and commercial InGaAs avalanche photodiode indicated good agreement between both devices. The validation included detecting 11-km-range hard targets, 5-km atmospheric structure consisting of cirrus clouds, and a near-field boundary layer. Far-field low intensity and spatially narrow atmospheric features were also detectable with the new phototransistor. Preliminary results related to systematic effects are discussed in the first attempt of incorporating a phototransistor in a lidar system.

Paper Details

Date Published: 1 August 2007
PDF: 8 pages
Opt. Eng. 46(8) 086001 doi: 10.1117/1.2772280
Published in: Optical Engineering Volume 46, Issue 8
Show Author Affiliations
Tamer F. Refaat, Old Dominion Univ. (United States)
Syed Ismail, NASA Langley Research Ctr. (United States)
Terry L. Mack, NASA Langley Research Ctr. (United States)
M. Nurul Abedin, NASA Langley Research Ctr. (United States)
Shane D. Mayor, National Ctr. for Atmospheric Research (United States)
Scott M. Spuler, National Ctr. for Atmospheric Research (United States)
Upendra N. Singh, NASA Langley Research Ctr. (United States)


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