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Adjusting the Height of Heat Sink Heterojunction Lasers to Meet Up With Optical Couplers and Waveguides

IP.com Disclosure Number: IPCOM000083084D
Original Publication Date: 1975-Mar-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 22K

Publishing Venue

IBM

Related People

Hutchins, GL: AUTHOR

Abstract

An important consideration for long life and stability in heterojunction lasers is effective heat sinking. While copper is not necessarily the best material for heat sinking, it does exhibit some advantages.

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Adjusting the Height of Heat Sink Heterojunction Lasers to Meet Up With Optical Couplers and Waveguides

An important consideration for long life and stability in heterojunction lasers is effective heat sinking. While copper is not necessarily the best material for heat sinking, it does exhibit some advantages.

The copper mesa heat sink has been shown to be a fairly effective heat sink for heterojunction lasers. The figure shows the mesa heat sink arranged in a manner to provide flexibility in designing an optical coupler for the heterojunction laser, for use in optical communications, and the like.

As shown, junction laser 1 is mounted upon mesa 3 of heat sink 9. In fabricating the device, the mesa height is calculated so that the emission height of the laser is matched to the input height of optical coupler 5, such that close proximity of emission to the coupler can be achieved. With such an arrangement, engineering variations in the optical coupler design can be compensated for by varying the height of the mesa.

The mesa is created by first polishing the copper heat sink. Then, using photolithography, the unwanted material is etched away leaving a polished mesa untouched in its original flatness. The depth of etch determines the mesa height. After the appropriate mesa height has been established, the laser may be bonded onto the mesa, and the surrounding copper may be chemically polished before optical coupler 5 is mounted thereon. Optical coupler 5 may be a fi...