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Development of eye-safe lidar for aerosol measurementsResearch is summarized on the development of an eye safe Raman conversion system to carry out lidar measurements of aerosol and clouds from an airborne platform. Radiation is produced at the first Stokes wavelength of 1.54 micron in the eye safe infrared, when methane is used as the Raman-active medium, the pump source being a Nd:YAG laser at 1.064 micron. Results are presented for an experimental study of the dependence of the 1.54 micron first Stokes radiation on the focusing geometry, methane gas pressure, and pump energy. The specific new technique developed for optimizing the first Stokes generation involves retroreflecting the backward-generated first Stokes light back into the Raman cell as a seed Stokes beam which is then amplified in the temporal tail of the pump beam. Almost 20 percent conversion to 1.54 micron is obtained. Complete, assembled hardware for the Raman conversion system was delivered to the Goddard Space Flight Center for a successful GLOBE flight (1989) to measure aerosol backscatter around the Pacific basin.
Document ID
19900017187
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Singh, Upendra N.
(Maryland Univ. College Park, MD, United States)
Wilderson, Thomas D.
(Maryland Univ. College Park, MD, United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1990
Subject Category
Man/System Technology And Life Support
Report/Patent Number
BN-1114
NAS 1.26:186905
NASA-CR-186905
Accession Number
90N26503
Funding Number(s)
CONTRACT_GRANT: NAG5-1114
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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