Semiconductor surface emitting laser having enhanced polarizatio

Details Semiconductor surface emitting laser having enhanced polarizatio Semiconductor surface emitting laser having enhanced polarizatio

Filed on

1993-03-29

Date issued

1994-09-06

Examiner

Epps, Georgia Y.

Patent Class

Coherent light generators

SubClass

Particular active media

SubSubClass

Semiconductor

Other Related Categories

372 46, 372 96, 372 99, H01S 319

Type

Patent

Status

active

Patent number

053454626

Description

ABSTRACT:
Applicant has demonstrated that by appropriately shaping the laser gain region one can control the polarization direction of semiconductor vertical cavity lasers and enhance their transverse mode selectivity. Specifically, configuring the transverse cross section to regions have a length-to-width ratio in excess of 1.2 favors emission with polarization in the long dimension at the fundamental mode. A cruciform structure favors emission with switchable orthogonal polarization. The transverse shape can be configured by dry etching a particular cavity shape in index guided lasers or by forming a shaped ion implantation region around gain guided lasers.

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patent: 5115441 (1992-05-01), Kopf et al.
patent: 5226053 (1993-07-01), Cho et al.
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T. Mukaihara, et al. "Engineered polarization control of GaAs/AlGaAs surface emitting lasers by anisotropic stress from elliptical etched substrate hole," Photon. Tech. Lett. vol. 5, p. 133 (1993)-Feb.
A. Chavez-Pirson, et al. "Polarization properties of a vertical-cavity surface emitting laser using a fractional layer superlattice gain medium", Appl. Phys. Lett. vol. 62, p. 3082 (1993)-Jun.
P. L. Gourley, et al. "High-efficiency TEM sub 00 cw epitaxial surface-emitting lasers and effect of half-wave periodic gain", Appl. Phys. Lett. vol. 54, p. 1209 (1989)-Mar.
C. J. Chang-Hasnain, et al. "Transverse mode characteristics of vertical-cavity surface emitting lasers," Appl. Phys. Lett. vol. 57, p. 218 (1990)-Jul.
M. Mori, et al. "Effect of cavity size on lasing characteristics of a distributed Bragg reflector surface emitting laser with buried heterostructure", Appl. Phys. Lett. vol. 60, p. 21 (1992)-Jan.
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