| 摘要 |
PROBLEM TO BE SOLVED: To provide a laser oscillation wavelength control method which is suitable for detecting the oscillation wavelength of an emission beam from a laser element and controlling the oscillation wavelength with high definition. SOLUTION: The laser beam to be emitted from the one laser element is received by respectively using the two light receiving means which are mutually different in wavelength response characteristic. The beam receiving amounts by the respective light receiving means are mutually compared so as to detect the oscillation wavelength of the laser beam. Specifically, the emission beam from the laser element is received via a wavelength selectable optical filter. The driving electric current of the laser element is varied in response to the beam receiving amounts so as to control the oscillation wavelength. COPYRIGHT: (C)2007,JPO&INPIT
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