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Optical Engineering

Multiple-stripe and broad-area diode lasers operating at high power: aging and thermal degradation influences on performance
Author(s): Murphy J. Landry; Jeffrey W. Rupert; Anthony Mittas
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Paper Abstract

This paper describes aging and thermal degradation influences on the performance of multiple-stripe and broad-area GaAlAs semiconductor diode lasers operating continuously at high power. Multiple-stripe and broad-area lasers emit large output powers (4 and 5 W) and large efficiencies (39 and 50%) at currents of 4 and 7.2 x Ith. At high currents of 4 x Ith multiple-stripe lasers emit beams containing multiple modes. These beams can have small consistent θpd divergences (13 deg) making it easy to couple into optical fibers for applications. Current increases in multiple-stripe lasers have little effect on their performance. Broad-area lasers can emit a single ν = 8 mode at currents up to 4.3 x Ith but have large divergences (60 deg) making it difficult to couple into optical fibers. During burn-in, aging lasers can emit erratic optical beams. After aging, the output power and efficiency of a multiple-stripe laser decrease (3 and 6%), while that of a modified multiple-stripe laser increase (3.5 and 5%). Thermoelectric cooling instead of heat-fin cooling increases the output power and efficiency of a multiple-stripe laser (7.4 and 6%), and longer shot intervals increases the output power (5.4%). Modified multiple-stripe and broad-area lasers emit similar broad beams centered on their optical axes, and the beams get broader as current increases.

Paper Details

PDF: 9 pages
Opt. Eng. 32(1) doi: 10.1117/12.60919
Published in: Optical Engineering Volume 32, Issue 1, January 1993
Show Author Affiliations
Murphy J. Landry, SCOT Inc. (United States)
Jeffrey W. Rupert, Raycon Corp. (United States)
Anthony Mittas, Sandia National Labs. (United States)

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