Browse Prior Art Database

Superlattice Surface Laser

IP.com Disclosure Number: IPCOM000077129D
Original Publication Date: 1972-Jun-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Zory, P: AUTHOR [+2]

Abstract

A method has been developed for preparing one-dimension superlattice structures of gallium aluminum arsenide and is described in IBM Research Report RC-3363. These structures are composed of thin, sandwich-type layers of Ga(1-x)Al(x)As where x, for example, can be changed from 0.16 to 0.24 in alternating layers. Structures have been made with 20 periods, each period being 1000 Angstroms wide. When pumped by an electron beam, the smaller gap material (x = 0.16) has a peak fluorescent output wavelength Lambda(s) approx. = 0.765 while the larger gap (x = 0.24) has Lambda(l) approx. = 0.72 mu.

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Superlattice Surface Laser

A method has been developed for preparing one-dimension superlattice structures of gallium aluminum arsenide and is described in IBM Research Report RC-3363. These structures are composed of thin, sandwich-type layers of Ga(1-x)Al(x)As where x, for example, can be changed from 0.16 to 0.24 in alternating layers. Structures have been made with 20 periods, each period being 1000 Angstroms wide. When pumped by an electron beam, the smaller gap material (x = 0.16) has a peak fluorescent output wavelength Lambda(s) approx. = 0.765 while the larger gap (x = 0.24) has Lambda(l) approx. = 0.72 mu. If stimulated emission can be obtained by either electron beam or optical pumping of the smaller gap material (the large gap material need not exhibit stimulated emission), then it is possible that a superlattice structure with a period somewhere in the vicinity of q(Lambda(s)/2n(s)), q = 1, 2. 3 ... (n(s) absolutely = refractive index at Lambda(s)) will emit narrow band (<1 Angstrom) laser radiation when pumped by an appropriate electron or optical beam.

The mechanism whereby the narrow-band output is generated, is in essence the multiple interference effects occurring within the periodically distributed gain medium. The drawing shows a schematic of an experimental configuration which could be used to check out the possibility of obtaining the described laser radiation.

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