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Proceedings Paper

Engineering of optical modes in vertical-cavity microresonators by aperture placement: applications to single-mode and near-field lasers
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Paper Abstract

Oxide–confined vertical cavity surface emitting lasers (VCSEL) are inherently leaky structures, despite the fact that the oxidized periphery region surrounding the all–semiconductor core has a lower refractive index. The reason is that the VCSEL modes in the non–oxidized core region can be coupled to tilted modes in the selectively oxidized periphery as the orthogonality between the core mode and the modes at the periphery is broken by the oxidation–induced optical field redistribution. Engineered VCSEL designs show that the overlap between the VCSEL mode of the core and the tilted mode in the periphery can reach >30% resulting in significant leakage. Three–dimensional modeling confirms that the leakage losses are much stronger for high order transverse modes which have a higher field intensity close to the oxidized region. Single mode lasing in the fundamental mode can thus proceed up to large aperture diameters. A 850–nm GaAlAs leaky VCSEL based on this concept is designed, modeled and fabricated, showing single–mode lasing with aperture diameters up to 5 μm. Side mode suppression ratio >20dB is realized at the current density of 10kA/cm2 in devices with the series resistance of 90 Ω.

Paper Details

Date Published: 20 March 2015
PDF: 12 pages
Proc. SPIE 9381, Vertical-Cavity Surface-Emitting Lasers XIX, 93810V (20 March 2015); doi: 10.1117/12.2077012
Show Author Affiliations
V. A. Shchukin, VI Systems GmbH (Germany)
N. N. Ledentsov, VI Systems GmbH (Germany)
J.-R. Kropp, VI Systems GmbH (Germany)
G. Steinle, VI Systems GmbH (Germany)
N. N. Ledentsov Jr., VI Systems GmbH (Germany)
K. D. Choquette, Univ. of Illinois at Urbana-Champaign (United States)
S. Burger, Zuse Institute Berlin (Germany)
JCMwave GmbH (Germany)
F. Schmidt, Zuse Institute Berlin (Germany)
JCMwave GmbH (Germany)

Published in SPIE Proceedings Vol. 9381:
Vertical-Cavity Surface-Emitting Lasers XIX
Chun Lei; Kent D. Choquette, Editor(s)

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