CAJ | 학술논문

基于推导的倍频晶体匹配角与温度关系的理论分析，揭示了温度对频率转换过程影响的热光物理机制。数值模拟了频率转换过程中二倍频与三倍频晶体的匹配角热敏感性。由于不同晶体材料热敏感性的差异性，实验获得了激光装置中所用晶体材料的匹配角随温度变化的关系曲线。理论分析了不同输入功率密度情况下匹配角失谐对三倍频过程的影响，并在线验证了温度变化导致匹配角失谐，进而引起三倍频转换效率的下降。根据实验获得的晶体匹配角的热敏感性参数，提出利用晶体角度跟随方法进行三倍频转换效率补偿，实现了三倍频能量的稳定输出。
기우추도적배빈정체필배각여온도관계적이론분석，게시료온도대빈솔전환과정영향적열광물리궤제。수치모의료빈솔전환과정중이배빈여삼배빈정체적필배각열민감성。유우불동정체재료열민감성적차이성，실험획득료격광장치중소용정체재료적필배각수온도변화적관계곡선。이론분석료불동수입공솔밀도정황하필배각실해대삼배빈과정적영향，병재선험증료온도변화도치필배각실해，진이인기삼배빈전환효솔적하강。근거실험획득적정체필배각적열민감성삼수，제출이용정체각도근수방법진행삼배빈전환효솔보상，실현료삼배빈능량적은정수출。
Based on the analytical solution of the dependence of phase matching angle on the crystal temperature,we illus-trate the thermo-optic physical mechanism of temperature influence on the frequency conversion.The thermal sensitivity of the doubler and tripler crystals are numerically simulated respectively.Due to such sensitivity discrepancy among various crystals,the phase matching angle curve regarding the crystal temperature variation in our laser facility is obtained in experiment.The influ-ence of PM angular detune on frequency conversion is theoretically analyzed under different input intensities,which is demonstra-ted by the conversion efficiency decline induced by temperature variation.According to the thermal sensitivity parameter obtained in experiments,we compensate the conversion efficiency with the crystal angle following,resulting in stable output of third har-monic energy.