Browse Prior Art Database

Method for Improving Junction Laser Arrays

IP.com Disclosure Number: IPCOM000081704D
Original Publication Date: 1974-Jul-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Marinace, JC: AUTHOR [+2]

Abstract

It has been found, contrary to intuition, that placing a narrow slit over the emitting surface of a junction laser allows a large amount of light to emerge. An extremely small bright light source is thereby produced.

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Method for Improving Junction Laser Arrays

It has been found, contrary to intuition, that placing a narrow slit over the emitting surface of a junction laser allows a large amount of light to emerge. An extremely small bright light source is thereby produced.

Referring to the figure, a flat piece of glass plate 1 about 200 Mu m thick has a layer 2 consisting of approximately 1500 Angstroms of chromium (Cr) and approximately 5000 Angstroms of gold (Au) deposited on a surface thereof. Using the same photoresist mask (with slots 1.5-2 Mu m wide) which is used to make the diffused laser array 3, slits 4 are etched in the Au-Cr layer 2 having the same periodicity as that of the junctions 5 of the array. 1000-2000 Angstroms of SiO(2) is deposited over Au-Cr layer 2. Glass plate 1 is then scribed and separated into pieces with length and width dimensions appreciably larger than laser array 3.

Substrate 6 is mounted in a package as described in the IBM Journal of Research and Development, Vol. 15, No. 4, July 1971, p. 258. In the course of fabrication, care should be taken to insure that the edge of substrate 6 is either flush with the side of the package or protruding slightly.

The laser array package, which includes a printed-circuit board 7 and a heat sink and holder 8, is placed on its side with array 3 uppermost under a microscope and a small amount of liquid epoxy 9 is placed on holder 8 near, but not on, the edge of array 3. The glass-Au-Cr slit arrangement is pla...