| 摘要 |
PROBLEM TO BE SOLVED: To provide a wavelength-variable laser source which can vary the wavelength in a large band stably with monochromaticity. SOLUTION: A semiconductor laser 11, an optical deflecting portion 13, and a diffraction grating 15 are provided, and the incident angle to the diffraction grating 15 is changed by the optical deflection portion 13, thereby an external resonator is configured. By having an external resonator mode group moves almost, as it is, within the variation of a minute wavelength which is of about a filter width, by appropriately choosing the spacing between the optical deflecting portion and the diffraction grating, and 60% or more is synchronized, thereby scanning wavelength at high speed can be performed, while maintaining a narrow line width. COPYRIGHT: (C)2009,JPO&INPIT
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