Semiconductor laser device and optical disc apparatus provided w

Details Semiconductor laser device and optical disc apparatus provided w Semiconductor laser device and optical disc apparatus provided w

1995-12-18

1997-06-10

Bovernick, Rodney B.

Coherent light generators

Particular active media

Semiconductor

372 36, H01S 319, H01S 304

Patent

active

056383916

ABSTRACT:
A semiconductor laser device includes: a substrate serving as a heat sink; a thermal buffer plate disposed on the surface of the substrate; a first semiconductor laser chip having first and second main surfaces and including a first light emitting point in the vicinity of the first main surface, the first semiconductor laser chip being disposed on the surface of the thermal buffer plate at the second main surface; spaced apart thermal conductors disposed on the first main surface of the first semiconductor laser chip spaced from the first light emitting point with the first light emitting point between them; a second semiconductor laser chip having third and fourth main surfaces and including a second light emitting point in the vicinity of the third main surface, the second semiconductor laser chip being disposed on the thermal conductors at the third main surface so that the light radiation direction of the second semiconductor laser chip is parallel to the light radiation direction of the first semiconductor laser chip, wherein the second light emitting point is opposed to and close to the first emitting point. Even when the environmental temperature changes, the expansion and contraction of the interval between the light emitting points is smaller than in prior art structures.

REFERENCES:
patent: 5086431 (1992-02-01), Hardy, Jr. et al.
Kato et al., "Hybrid Laser Array With Closely Spaced Dual Beams", 35th Applied Physics of Japan and Related Societies Meeting, 1988, pp. 898 and 30p-ZO-3 (no month).

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