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Proceedings Paper

Facet engineering of high power single emitters
Author(s): Dan Yanson; Moshe Levi; Moshe Shamay; Renana Tesler; Noam Rappaport; Yaroslav Don; Yoram Karni; Itzhak Schnitzer; Noam Sicron; Sergey Shusterman
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Paper Abstract

The ever increasing demand for high-power, high-reliability operation of single emitters at 9xx nm wavelengths requires the development of laser diodes with improved facet regions immune to both catastrophic and wear-out failure modes. In our study, we have evaluated several laser facet definition technologies in application to 90 micron aperture single emitters in asymmetric design (In)GaAs/AlGaAs based material emitting at 915, 925 and 980nm. A common epitaxy and emitter design makes for a straightforward comparison of the facet technologies investigated. Our study corroborates a clear trend of increasing difficulty in obtaining reliable laser operation from 980nm down to 915nm. At 980nm, one can employ dielectric facet passivation with a pre-clean cycle delivering a device lifetime in excess of 3,000 hours at increasing current steps. At 925nm, quantum-well intermixing can be used to define non-absorbing mirrors giving good device reliability, albeit with a large efficiency penalty. Vacuum cleaved emitters have delivered excellent reliability at 915nm, and can be expected to perform just as well at 925 and 980nm. Epitaxial regrowth of laser facets is under development and has yet to demonstrate an appreciable reliability improvement. Only a weak correlation between start-of-life catastrophic optical mirror damage (COMD) levels and reliability was established. The optimized facet design has delivered maximum powers in excess of 19 MW/ (rollover limited) and product-grade 980nm single emitters with a slope efficiency of >1 W/A and a peak efficiency of >60%. The devices have accumulated over 1,500 hours of CW operation at 11W. A fiber-coupled device emits 10W ex-fiber with 47% efficiency.

Paper Details

Date Published: 21 February 2011
PDF: 12 pages
Proc. SPIE 7918, High-Power Diode Laser Technology and Applications IX, 79180Z (21 February 2011); doi: 10.1117/12.876261
Show Author Affiliations
Dan Yanson, SCD - Semiconductor Devices (Israel)
Moshe Levi, SCD - Semiconductor Devices (Israel)
Moshe Shamay, SCD - Semiconductor Devices (Israel)
Renana Tesler, SCD - Semiconductor Devices (Israel)
Noam Rappaport, SCD - Semiconductor Devices (Israel)
Yaroslav Don, SCD - Semiconductor Devices (Israel)
Yoram Karni, SCD - Semiconductor Devices (Israel)
Itzhak Schnitzer, SCD - Semiconductor Devices (Israel)
Noam Sicron, Soreq NRC (Israel)
Sergey Shusterman, Soreq NRC (Israel)

Published in SPIE Proceedings Vol. 7918:
High-Power Diode Laser Technology and Applications IX
Mark S. Zediker, Editor(s)

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