Asahi Glass Company, Limited

Anritsu Corporation

Motoichi Ohtsu

Yuzuru Tanabe

Tadanori Senoh

A harmonic wave generator comprises a semiconductor laser for generating a fundamental wave and a KNbO.sub.3 crystal which transforms the fundamental wave to a harmonic wave, wherein the KNbO.sub.3 crystal is provided with electrodes for applying an electric field to a pair of opposing surfaces of the crystal.

Harmonic wave generator, a method of producing a harmonic wave and a

A laser emits a laser beam with a predetermined frequency, serving as pumping light, to a double resonance section. A VCO oscillates a predetermined frequency signal that is the origin of a microwave. An oscillator oscillates a modulation signal and a low frequency signal to be a reference signal for a sync detection. A synthesizer generates a microwave acquired by subjecting the predetermined frequency signal to multiplication and phase modulation in accordance with the predetermined frequency signal and the modulation signal, and applies the microwave to the double resonance section. A photosensor detects a component of the laser beam modulated by the double resonance section. A PSD detects the level and phase of an output signal of the photosensor with the reference signal. A sweep signal generator generates a sweep signal for the microwave. A switch has first and second nodes to be mutually switched from one to the other, and feeds a PSD output back to the VCO when switched to the first node, and supplies the sweep signal to the VCO to permit sweeping of the frequency of the microwave when switched to the second node. An integration processor detects the amount of shift of a microwave resonance frequency according to the PSD output and feeds a laser frequency compensation signal back to the laser, in a state where the switch is set to the second node.

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Yamato, Japan

Motoichi Ohtsu