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Proceedings Paper

Improving reliability of high power quasi-CW laser diode arrays for pumping solid state lasers
Author(s): Farzin Amzajerdian; Byron L. Meadows; Nathaniel R. Baker; Bruce W Barnes; Renee S. Baggott; George E Lockard; Upendra N. Singh; Michael J. Kavaya
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Paper Abstract

Most Lidar applications rely on moderate to high power solid state lasers to generate the required transmitted pulses. However, the reliability of solid state lasers, which can operate autonomously over long periods, is constrained by their laser diode pump arrays. Thermal cycling of the active regions is considered the primary reason for rapid degradation of the quasi-CW high power laser diode arrays, and the excessive temperature rise is the leading suspect in premature failure. The thermal issues of laser diode arrays are even more drastic for 2-micron solid state lasers which require considerably longer pump pulses compared to the more commonly used pump arrays for 1-micron lasers. This paper describes several advanced packaging techniques being employed for more efficient heat removal from the active regions of the laser diode bars. Experimental results for several high power laser diode array devices will be reported and their performance when operated at long pulsewidths of about 1msec will be described.

Paper Details

Date Published: 10 September 2005
PDF: 7 pages
Proc. SPIE 5887, Lidar Remote Sensing for Environmental Monitoring VI, 58870E (10 September 2005); doi: 10.1117/12.620102
Show Author Affiliations
Farzin Amzajerdian, NASA Langley Research Ctr. (United States)
Byron L. Meadows, NASA Langley Research Ctr. (United States)
Nathaniel R. Baker, Lockheed Martin Engineering and Science Co. (United States)
Bruce W Barnes, NASA Langley Research Ctr. (United States)
Renee S. Baggott, Science and Technology Corp. (United States)
George E Lockard, NASA Langley Research Ctr. (United States)
Upendra N. Singh, NASA Langley Research Ctr. (United States)
Michael J. Kavaya, NASA Langley Research Ctr. (United States)


Published in SPIE Proceedings Vol. 5887:
Lidar Remote Sensing for Environmental Monitoring VI
Upendra N. Singh, Editor(s)

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