Browse Prior Art Database

MODE CONTROL OF PHASED LOCKED SEIVIICONDUCTOR LASERS

IP.com Disclosure Number: IPCOM000025607D
Original Publication Date: 1986-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 6 page(s) / 292K

Publishing Venue

Xerox Disclosure Journal

Abstract

Contact stripe geometry in multi-stripe semiconductor array lasers may be designed to control the supermodes of a multi-emitter, phased array laser to obtain preferred fundamental supermode operation having a single lobe in the far field pattern.

This text was extracted from a PDF file.
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CEROX DISCLOSURE JOURNAL

MODE CONTROL OF PHASED LOCKED SEIVIICONDUCTOR LASERS
William Streifer
Thomas J. Paoli
Robert D Burnham

CLEAVED FACET

Proposed Classification US Cl, 372/45
Imt. C1. HOls 3/19

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Volume 11 Number 4 July/August 1986 195

PUMPING STRIPES

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MODE CONTROL OF PHASED LOCKED SEMICONDUCTOR LASERS (Cont'd)

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  XEROX DISCLOSURE JOURNAL Volume 11 Number 4 July/Araipst 1986

196

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

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MODE CONTROL OF PHASED LOCKED SEMICONDUCTOR LASERS (Cont'd)

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  XEROX DISCLOSURE JOURNAL Volume If Number 4 July/August 1986

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MODE CONTROL OF PHASED LOCKED SEMICONDUCTOR LASERS (Csnt'd)

Contact stripe geometry in multi-stripe semiconductor array lasers may be designed to control the supermodes of a multi-emitter, phased array laser to obtain preferred fundamental supermode operation having a single lobe in the far field pattern.

The concept is to introduce asymmetry into the stripe geometry of an array laser so that a supermode radiating with a narrow divergence, single lobe output beam will be favored, Figure 1 illustrates the introduction of asymmetry by forming the multiple stripes of an array laser at a small angle,
e.g., 2" to lo", relative to the end cleaved facets of the laser. The predominant lobe will radiate at an angle to the end facets, but the array laser itself may be rotated so that the output is aligned in the desired direction.

Figure 2 illustrates another form of stripe geometry introducing asymmetry by uniformly varying the stripe separation across the array of laser stripes The stripe separation varies uniformly from one side of the laser to the other In the example shown, there are 3 pm wide stripes which center-to-center spacings vary from 6 prn to 10 pm in 0.5 pm steps

Figure 3 illustrates still another stripe form of geometry introducing asymmetry by uniformly varying stripe widths from one side of the laser to the other across the array of stripes while the separation between stripes is maintained the same.

It is also possible to obtain the same asymmetry for supermode operation by combining the stripe separation variation of Figure 2 with the stripe width variation of Figure 3

Figure 4 illustrates a further form of stripe geometry introducing asymmetry by varying stripe widths starting with a single widest stripe in the center of the laser structure followed in opposite directions with parallel stripes having uniformly decreasing stripe widths to the sides...