| 摘要 |
There is provided an external resonator type semiconductor laser having a greater output or more preferable single-mode characteristic than the conventional external resonator type semiconductor laser. The external resonator type semiconductor laser includes a laser diode (11), a window glass (16), a grating, and a lens and has some improvements. The first improvement is that the window glass (16) is inclined by a predetermined angle with respect to the light emitting surface (19) of the laser diode (11). The second improvement is that arrangement of the laser diode (11) and the like is adjusted so that the S wave is applied to the grating. The third improvement is that the laser diode (11) is configured so that generation of kink is suppressed when the output power is 45 mW or below. The other improvements are to set the reflectance of the light emitting surface of the laser diode (11), the numerical aperture of the lens, the length of the external resonator, and the primary light reflectance in the grating to optimal values, respectively.
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