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

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

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摘要

An InGaAsSb/AlGaAsSb phototransistor has been validatedfor 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-(mu)m wavelength, the validation was performed at 1.543 (mu)m, 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.

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