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Proceedings Paper

Thermal characteristics of high-power long-pulsewidth quasi-CW laser diode arrays
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Paper Abstract

2-micron solid-state lasers operating at moderate to high pulse energies require high power quasi-CW laser diode arrays (LDAs) operating at a nominal wavelength of 792 nm with pulse durations of at least one millisecond. This long pulse duration is one of the main causes of limited lifetimes for these arrays. Such relatively long pulse durations cause the laser diode active region to experience high peak temperatures and drastic thermal cycling. This extreme localized heating and thermal cycling of the active regions are considered the primary contributing factors for both gradual and catastrophic degradation of LDAs. This paper describes the thermal characteristics of various LDA packages, providing valuable insight for improving their heat dissipation and increasing their lifetime. The experiment includes both direct measurement of thermal radiation of the LDA facet using a high resolution IR camera and indirect measurement of LDA active region temperature by monitoring the wavelength shift of the near-IR light. The result of thermal measurements on different quasi-CW LDA packages and architectures is reported.

Paper Details

Date Published: 1 June 2004
PDF: 9 pages
Proc. SPIE 5336, High-Power Diode Laser Technology and Applications II, (1 June 2004); doi: 10.1117/12.531760
Show Author Affiliations
Byron L. Meadows, NASA Langley Research Ctr. (United States)
Farzin Amzajerdian, NASA Langley Research Ctr. (United States)
Nathaniel R. Baker, Lockheed Martin Engineering and Science Co. (United States)
Vikas Sudesh, Science and Technology Corp. (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. 5336:
High-Power Diode Laser Technology and Applications II
Mark S. Zediker, Editor(s)

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