Matsushita Electric Industrial Co., Ltd.

Shigeru Ohmori

Kazuhisa Yamamoto

Yoichi Sasai

Tetsuo Taniuchi

A laser source with small output fluctuations due to variations in ambient temperature. The frequency doubler, which has an optical waveguide formed on the substrate of its nonlinear optical crystal, and the laser generator are fixed on the same optical axis within the lens barrel. Moreover, the material used for the lens barrel has a thermal expansion coefficient which is substantially similar to that of the nonlinear optical crystal.

Laser source

When fabricating an optical wavelength by proton exchange method on a substrate of LiNb.sub.x Ta.sub.1-x O.sub.3 (0.ltoreq.x.ltoreq.1), by using Ta.sub.2 O.sub.5 as the protective mask, the edge of the mask becomes smooth and diffusion of impurity from the protective mask into the substrate does not occur during heat treatment, and the propagation loss may be notably reduced. As a result, the efficiency of the frequency doubler may be enhanced.

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Osaka, Japan

Shigeru Ohmori