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Thermal effects on cavity stability of chromium- and neodymium-doped gadolinium scandium gallium garnet laser under solar-simulator pumpingResults are presented on testing a Cr- and Nd-codoped Gd-Sc-Ga-garnet (Cr:Nd:GSGG) crystal and a Nd:YAG crystal (both of 3.2 mm diam and 76-mm long) for pulsed and CW laser operations using a flashlamp and solar simulator as pumping sources. Results from experiments with the flashlamp show that, at pulse lengths of 0.11, 0.28, and 0.90 ms, the slope efficiency of the Cd:Nd:GSGG crystal was higher than that of the Nd:YAG crystal and increased with pulse width. With the solar simulator, however, the CW laser operation of the Cr:Nd:GSGG crystal was limited to intensities not greater than 1500 solar constants, while the Nd:YAG laser successfully performed for all pump beam intensities available. It was found that the exposure for several minutes of the Cr:Nd:GSGG crystal to pump beam intensity of 3000 solar constants led to its damage by thermal cracking, indicating that a better solar-pumped CW laser performance may be difficult to realize with rod geometry.
Document ID
19910044758
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Kim, Kyong H. (Hampton Univ. VA, United States)
Venable, Demetrius D. (Hampton Univ. VA, United States)
Brown, Lamarr A. (Hampton University VA, United States)
Lee, Ja H. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 14, 2013
Publication Date
March 1, 1991
Publication Information
Publication: Journal of Applied Physics
Volume: 69
ISSN: 0021-8979
Subject Category
LASERS AND MASERS
Funding Number(s)
CONTRACT_GRANT: NAG1-400
CONTRACT_GRANT: NAG1-441
Distribution Limits
Public
Copyright
Other