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Proceedings Paper

Threshold minimization and directional laser emission from GaN microdisks
Author(s): Nathan B. Rex; Richard K. Chang; Louis J. Guido
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Paper Abstract

2-micrometers thick GaN microdisks with the following shapes: circular; square; and quadrupolar with various deformation amplitudes have been investigated by optical pumping. For circular microdisks, the minimum laser threshold was found when the pump is a ring-shaped 355 nm laser beam. An imaging technique is used to photograph (with a CCD camera) the sidewall of the microdisk at various angles in the horizontal plane. From the imaging results as a function of observation angle, it is possible to extract information about the laser output location along the sidewall and its far-field angular pattern. Image results for the quadrupoles (with optical pumping of the top face) suggest that the directionality of laser emission is associated with chaotic- orbits that emerge just outside the highest curvature edges. With focused pumping of the same quadrupole structures at the middle of the top face, only Fabry-Perot modes involving the two lowest curvature interfaces are observed.

Paper Details

Date Published: 12 May 2000
PDF: 7 pages
Proc. SPIE 3930, Laser Resonators III, (12 May 2000); doi: 10.1117/12.385399
Show Author Affiliations
Nathan B. Rex, Yale Univ. (United States)
Richard K. Chang, Yale Univ. (United States)
Louis J. Guido, Virginia Polytechnic Institute and State Univ. (United States)

Published in SPIE Proceedings Vol. 3930:
Laser Resonators III
Alexis V. Kudryashov; Alan H. Paxton, Editor(s)

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