| 摘要 |
PROBLEM TO BE SOLVED: To provide a wavelength determination device and a wavelength determination method capable of determining a wavelength of a laser beam emitted from an external resonator type semiconductor laser, over a wide range. SOLUTION: The laser beam emitted from the external resonator type semiconductor laser 50 is determined in two steps by two detectors 202, 203. The detector 202 is provided with an optical wedge 204, and light intensity of a reflected beam thereof is detected by a two-divided detector 206. The detector 203 is provided with an optical wedge 205, and light intensity of a reflected beam thereof is detected by a two-divided detector 207. Wedge angles and plate thicknesses of the two optical wedges 204, 205 are regulated to generate the substantially same interference fringe even when receiving respectively different wavelength ranges of laser beams. A rough wavelength range of the laser beam is determined thereby using a differential value from the two-divided detector 206, and a detail level of wavelength is determined thereafter using a differential value from the two-divided detector 207. COPYRIGHT: (C)2006,JPO&NCIPI
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