KH_2PO_4結晶により発生する第二高調波のビームプロファイル解析(機械要素,潤滑,工作,生産管理など)

概要

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n the harmonic generation using nonlinear optical crystals, it is well known that the frequencyconversion efficiency is very sensitive to temperature of the crystal, and its temperature rise is caused by laser absorption. In this study K_H2PO_4 (KDP) was supposed as a nonlinear optical crystal for second harmonic generation (SHG). Temperature dependence of conversion efficiency and output-beam profile were examined theoretically by solving the coupling problem composed of heat conduction equation and complex amplitude equatios. The latter equations have been derived in our previous study, considering laser absorption in the crystal. As a result, we revealed that remarkable inverse-conversion of SHG also appears for the repetitive laser irradiation with high power density, and consequential power density fluctuation in the crystal causes the disordered output-beam profile.
社団法人日本機械学会の論文
2004-09-25