| 摘要 |
A drive current is modulated by a current modulator, and the modulated drive current is supplied to a laser beam generator so that the laser beam emitted by the laser beam generator is varied in wavelength. The laser beam is applied to a frequency converter, and the maximum intensity of the laser beam from the frequency converter is detected by the light detector. Based on the detected intensity, the temperature of the laser beam generator is regulated by a temperature regulator. The wavelength of the laser beam generated by the laser beam generator is thus controlled so as to be best suited to the phase matching condition of the frequency converter. The harmonic generator is simple in arrangement and small in size, and can operate stably over a long period of time without deterioration due to aging.
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