Orc Manufacturing Co., Ltd.

Sonhi Hashimoto

Satoru Amano

Toshifumi Tone

The present invention is a wavelength conversion laser apparatus for converting wavelength by utilizing a nonlinear optical crystal and capable of safely using it over a long time. For this end, the fundamental wave laser light emitted from the pumping chamber unitwhich is a solid state laser light source is converted into the second harmonic wave by the first nonlinear optical crystal unit. And the second harmonic wave is, then, converted into the third (or fourth) harmonic wave by the second nonlinear optical crystal unit. Filled in the containerfor each of the nonlinear optical crystal unitsis a dry inert gas. A humidity sensordetects humidity inside the container. The output from the humidity sensoris supplied to the laser control portion. When the detected humidity exceeds a predetermined value, the laser oscillation is interrupted, thereby preventing the nonlinear optical crystal from being damaged in case of any defect in the sealing structure of the container.

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Tokyo, Japan

Sonhi Hashimoto