Coherent light generators – Particular active media – Semiconductor
Patent
1990-12-27
1992-09-29
Epps, Georgia Y.
Coherent light generators
Particular active media
Semiconductor
372 26, 372 38, 372 97, 372 10, H01S 319
Patent
active
051519151
ABSTRACT:
Modulation-induced thermal crosstalk between the independently addressable lasers of a monolithic multilaser array is reduced by forming each laser with two optically coupled active regions, an amplifier region and a modulator region, biasing the amplifier region in such a way that stimulated emission is caused to occur therein, and varying the electrical condition of the modulator region in order to modulate the lasers. Modulation of the laser output is achieved by varying the internal optical loss of the modulator region, known as Q-switching. In one form, control of this loss is achieved by varying the reverse bias voltage applied to the modulation region. In another form, control of this loss is achieved by selectively connecting and disconnecting regions of p-type and n-type material in the modulator region together. In a third form, control of this loss is achieved by selectively connecting and disconnecting the modulator region to ground potential. Q-switched operation of laser results in a cooling of the laser during operation, thereby reducing the transient heat generated during modulation, and thus reducing thermal crosstalk between lasers.
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Epps Georgia Y.
Small Jonathan A.
Xerox Corporation
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