| 摘要 |
PROBLEM TO BE SOLVED: To provide a wavelength scanning type laser light source which can scan the wavelengths of a light source having a narrow band spectrum in a wide band at a high speed and continuously, wherein the necessary number of optical isolators is reduced and the increase of the noises due to optical losses in the optical isolators is reduced. SOLUTION: This wavelength scanning type fiber laser light source comprises two ring-type resonant Fabry-Perot electro-optical modulators 11A, 11B having nearby FSRs (Free spectral range), an optical path for laser oscillation formed by connecting an optical amplifier 12 having a gain in the oscillation wavelength and an optical cup, etc., 14 from which output light is to be taken out together with an optical fiber, and a resonator length control unit 15 for periodically changing the resonator length of one Fabry-Perot resonator in a fixed range, and consists of a confocal Fabry-Perot electro-optical modulator wherein curvatures of respective concave mirrors are so set that the Fabry-Perot resonator including an electro-optical crystal becomes confocal, and optically modulates the passing light by a periodical scanning signal given by the resonator length control unit 15. COPYRIGHT: (C)2009,JPO&INPIT
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