Semiconductor laser device

Details Semiconductor laser device Semiconductor laser device

1991-10-18

1993-08-10

Davie, James W.

Coherent light generators

Particular active media

Semiconductor

H01S 319

Patent

active

052356094

ABSTRACT:
A semiconductor laser device comprises: an active layer; a lower clad layer provided below the active layer; an upper clad layer provided above the active layer; and a current blocking layer, provided above the upper clad layer, for limiting an active region of the active layer in a direction along a width to make the active region of a striped form which has a wide portion and a narrow portion. According to the device, coherence of an oscillated laser beam is reduced, thereby to decrease a feedback induced noise when used for a pickup of an optical information recording/reproducing apparatus.

REFERENCES:
patent: 4359776 (1982-11-01), Acket et al.
patent: 4594718 (1986-06-01), Scifres et al.

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