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Proceedings Paper

High-temperature lasing of long-wavelength VCSELs: problems and prospects
Author(s): Joachim Piprek
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Paper Abstract

For many years, the operation of long-wavelength (1.3 micrometer and 1.55 micrometer) vertical-cavity surface- emitting lasers (LW-VCSELs) was restricted to low temperatures. Continuous-wave lasing above room-temperature (up to 64 degrees Celsius) has been achieved only recently. The strong temperature sensitivity of the lasing threshold is well known from their edge-emitting counterparts, but LW- VCSELs exhibit principal differences. Focusing on the so far most successful concept of wafer-fused LW-VCSELs, the physical mechanisms are analyzed that affect their temperature sensitivity. The analysis includes optical gain, carrier losses, optical losses, and self-heating. Photon absorption within the valence bands and auger recombination are found to limit high-temperature lasing. Scaling down the active area by lateral oxidation, VCSEL self-heating can be reduced despite a rising thermal resistance. Based on an excellent agreement with measurements at lower temperatures, numerical VCSEL simulation is employed to investigate laser operation up to 120 degrees Celsius. With minimization of threshold current and absorption losses and with proper adjustment of the gain peak wavelength, high-temperature continuous-wave lasing is predicted that is less temperature sensitive than in edge-emitting lasers.

Paper Details

Date Published: 4 April 1997
PDF: 12 pages
Proc. SPIE 3003, Vertical-Cavity Surface-Emitting Lasers, (4 April 1997); doi: 10.1117/12.271066
Show Author Affiliations
Joachim Piprek, Univ. of Delaware (United States)


Published in SPIE Proceedings Vol. 3003:
Vertical-Cavity Surface-Emitting Lasers
Kent D. Choquette; Dennis G. Deppe, Editor(s)

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