| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a wavelength converting device which uses TYPE1 CLBO crystal in which a shift from phase matching conditions is suppressed, decrease in the wavelength conversion efficiency is suppressed and high average UV rays can be emitted. SOLUTION: In the wavelength converting device which uses a TYPE1 CLBO crystal 1, one point in the front half of the crystal in the incident side of light (almost center in the horizontal direction) is pressurized. By this method, distribution of phase mismatching caused in the crystal can be suppressed. Even when the crystal generates heat itself, decrease in the wavelength conversion efficiency can be suppressed and high average UV rays can be emitted. The pressurizing point is preferably 0 to 1/3 length in the front half of the CLBO crystal in the incident side.</p> |
