External cavity type semiconductor laser

Details External cavity type semiconductor laser External cavity type semiconductor laser

2004-11-30

2010-06-01

Harvey, Minsun (Department: 2828)

Coherent light generators

Particular active media

Semiconductor

C372S102000, C372S103000

Reexamination Certificate

active

07729400

ABSTRACT:
An external cavity type semiconductor laser that has a larger output and a more excellent single mode characteristic than a conventional external cavity type semiconductor laser is provided. The external cavity type semiconductor laser has a laser diode11, a window glass16, a grating, and a lens. The external cavity type semiconductor laser has several modifications over the conventional one. A first modification is that the window glass16is inclined to a beam emission surface19of a laser diode11for a predetermined angle. A second modification is that arrangements of the laser diode11and so forth are adjusted so that a S wave reaches the grating. A third modification is that when an output power of the laser diode11is 45 mW or less, a kink is suppressed. The other modifications are that a reflectance of a beam emission surface of the laser diode11, a numerical aperture of the lens, an external cavity length, and a reflectance of a first order beam of the grating are optimized to their proper values.

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