| 摘要 |
The external resonator type laser light source of the present invention is equipped with a rotation mechanism for varying a selected wavelength according to the angle of a mirror and a semiconductor laser provided with a reflection preventive film on one end surface, and which converts outgoing light from an end surface on the reflection preventive film side of the semiconductor laser to parallel light, returns this parallel light to a diffraction grating with the mirror after selecting the wavelength of this parallel light with the diffraction grating, and excites the laser by again selecting a wavelength with the diffraction grating and returning the light to the semiconductor laser; wherein, a wavelength monitor is provided that couples either outgoing light from the end surface of the semiconductor laser not provided with the reflection preventive film or zero-order light of the diffraction grating to an optical fiber, and into which any of the light which is not used for coupling to the optical fiber enters.
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