| 摘要 |
A wavelength-variable light source equipped with a semiconductor laser 1, one end of which is provided with an antireflection coating 1A, is equipped with a power correction filter 10 which permits transmission of the light output from the semiconductor laser 1, thereby rendering the characteristics of the output light substantially flat. The wavelength-variable light source is an external-resonator-type laser light source which converts the light output from the end face covered with the antireflection coating 1A of the semiconductor laser 1 into collimated light, subjects the light to wavelength selection by a wavelength selection optical element 2, returns the light to the wavelength selection optical element 2 by means of a mirror 3, to thereby subject the light again to wavelength selection by the wavelength selection optical element 2, feeds the light back to the semiconductor laser 1, and converges and outputs light output from the other end face of the semiconductor laser 1 on and to an optical fiber 4. The power correction filter 10 is interposed between the semiconductor laser 1 and the optical fiber 4.
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