Coherent light generators – Particular active media – Semiconductor
Patent
1993-04-15
1994-08-23
Davie, James W.
Coherent light generators
Particular active media
Semiconductor
372 22, 372 50, 372 92, H01S 319
Patent
active
053413903
ABSTRACT:
A surface emitting second harmonic generating device capable of generating a second harmonic at room temperatures with high efficiency and output power, and which has a small size, low energy consumption and a low manufacturing cost. A second harmonic is efficiently generated when the <100> direction of the semiconductor crystals within a cavity makes an angle of 5.degree. or more with respect to the direction of the light rays (particularly when one of the <111>, <211> and <110> directions approximately matches the direction of the light rays). Further, if a superlattice second harmonic generating layer composed of a III-V or II-VI compound semiconductor is provided between the output end reflector and the spacer layer, the second harmonic may be generated with even greater efficiency. In addition, the spacer layer may be formed by a superlattice, as may the active layer and the spacer layers. A second harmonic may also be efficiently generated by utilizing the spacer layer and the active layer as phase-matching layers.
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Ichimura Yoshikatsu
Yamada Norihide
Davie James W.
Hewlett--Packard Company
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