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Browse Prior Art Database

INTEGRATED REFLECTING POLARIZER

IP.com Disclosure Number: IPCOM000024003D
Original Publication Date: 1979-Jun-30
Included in the Prior Art Database: 2004-Apr-01
Document File: 2 page(s) / 321K

Publishing Venue

Xerox Disclosure Journal

Abstract

A single, heterostructure diode laser is shown in Figure 1 with integrated polarizing elements comprising a plurality of etched grooves 2 in the p-GaAsactive layer of the laser0 These grooves 2 are etched parallel to the (110) cleaved facets 3-. The edges of the grooves 2 are angled, as shown at 5, with respect to the direction of

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

INTEGRATED REFLECTING POLARIZER

Donald R. Scifres William Streifer

POLAR~Z~NG

ELEMENTS

ACT~VE

L AVER

CLEANED FACET

Proposed Classification

U.S. Cl. 331/94.5 N

mt. Cl. HOls 3/00

OUT

----~L~GHTOUT

CLEANED

FACET

CLEANED FACET

FIG. I

'3

/2 F/G.2a

FIG. 2b

Volume 4 Number 3 May/june 1979 359

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

Page 2 of 2

INTEGRATED REFLECTING POLARIZER (ConVd)

A single, heterostructure diode laser is shown in Figure 1 with integrated polarizing

elements comprising a plurality of etched grooves 2 in the p-~GaAsactive layer of the laser

    0 These grooves 2 are etched parallel to the (110) cleaved facets 3~. The edges of the grooves 2 are angled, as shown at 5, with respect to the direction of

optical wave propagation 4 (V~.shaped)so that different reflection coefficients are encountered for TE and TM polarizations

                       0 If this angle 5 corresponds to the Brewster angle, no light will be reflected out of the wave~guide for TM polarizations and therefore, TM modes will be the preferred lasing modes experiencing the lowest losses

0

The single heterostructure diode laser 10 with polarizing elements shown in Figure 2 is the same as that of Figure 1 except that grooves 12 are etched in the p~GaAs

active layer at an angle 15 relative to

                            0the (110) cleaved facets l3~ This angle approximates the Brewster angle of 45 relative to the cleaved facets l3~ The

edges of grooves 12 are not angled as in Figure 1 but are vertical

                                            0 I...