| 摘要 |
A wavelength locker 4 is provided at one light beam exit end of a laser diode 1. The wavelength locker 4 incorporates an interference optical filter 3, and photo diodes PD1, PD2 for detecting its transmitted light and reflected light. A thermistor 15 and a temperature detector 14 for detecting the temperature of the interference optical filter 3 are provided. Calculating the output ratio of the photo diodes PD1, PD2, the wavelength is controlled so that the correction value by the temperature of the output ratio may be a specified value. The laser diode 1 and wavelength locker 4 are sealed in an optical module 11, and mounted on a substrate together with other blocks. Thus is obtained a laser light source apparatus composed in a simple and small constitution within a emission possible wavelength range of laser light source and capable of emitting stably.
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