Coherent light generators – Particular active media – Semiconductor
Patent
1991-04-02
1992-12-22
Davie, James W.
Coherent light generators
Particular active media
Semiconductor
H01S 319
Patent
active
051739127
ABSTRACT:
A semiconductor laser diode of pn double hetero junction type which comprises a first active layer formed on a substrate for imparting a main oscillation, a second active layer adjacent to the first active layer in such a manner that at least one of the first and second active layers is formed of a multi quantum well or single quantum well structure, an intermediate clay layer interposed between the first active layer and the second active layer for preventing duplication of wave function of confined electrons of the respective active layers, and a graded refractive index distribution region (GRIN-SCH structure layer) provided on at least one of under the first active layer and over second active layer to reduce the refractive index thereof remotely from the active layers. Thus, the semiconductor laser diode can have high characteristic temperature and lower a threshold current at the time of laser oscillation and obtain preferable operation characteristics even under severe environments of temperature condition.
REFERENCES:
patent: 4999844 (1991-03-01), Imamoto
patent: 5003548 (1991-03-01), Bour et al.
patent: 5020068 (1991-05-01), Isshiki
Irikawa Michinori
Iwase Masayuki
Mand Randit S.
Davie James W.
The Furukawa Electric Co. Ltd.
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