Browse Prior Art Database

SUPPRESSION OF UNDESIRED LATERAL LASER OSCILLATION

IP.com Disclosure Number: IPCOM000025578D
Original Publication Date: 1986-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 93K

Publishing Venue

Xerox Disclosure Journal

Abstract

As an array of lasers becomes large, say 40 or more parallel emitters in a single array laser, there is an increasing tendency for the array laser to begin to lase in a direction perpendicular to the contact stripes of the array laser. This is also referred to as "edge-to-edge" laser operation. One way to eliminate this from occurring is to provide large unpumped end regions on these wide laser arrays in order to suppress this unwanted oscillation. These unpumped regions will absorb the edge-to-edge radiation or light. As a rule, the width of the unpumped regions at either end of the array contact stripes should be about one-half the length of the array to ensure that laser oscillation will only occur in the direction parallel with the contact stripe geometry,

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XEROX DISCLOSURE JOURNAL

SUPPRESSION OF UNDESIRED LATERAL LASER OSCILLATION
Donaid R. Scifres
Robert D. Burnham
William Streifer

Proposed Classif ication
U.S. C1. 372/45 Int. CI. HOls 3/19

25

As an array of lasers becomes large, say 40 or more parallel emitters in a single array laser, there is an increasing tendency for the array laser to begin to lase in a direction perpendicular to the contact stripes of the array laser. This is also referred to as "edge-to-edge" laser operation. One way to eliminate this from occurring is to provide large unpumped end regions on these wide laser arrays in order to suppress this unwanted oscillation. These unpumped regions will absorb the edge-to-edge radiation or light. As a rule, the width of the unpumped regions at either end of the array contact stripes should be about one-half the length of the array to ensure that laser oscillation will only occur in the direction parallel with the contact stripe geometry,

Volume I1 Number 2 March/April 1986 101

[This page contains 1 picture or other non-text object]

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SUPPRESSION OF UNDESIRED LATERAL LASER OSCILLATION (Con t'd)

Another approach to provide this suppression IS illustrated in Figure 1. Array laser 10 comprises substrate 12 of n-CaAs upon which is epitaxlally deposited cladding layer 14 of n-Cal,,Al,As, active region 16 of n, p or undoped GaAs or Cal-yAlyAs (where x)y) or a single or multiple quantum well, cladding layer 18 of p-Gal,xAl,As and cap layer 20 of +/-G...