【摘要】 为了研究GaSe晶体的倍频(SHG)及色散性质,采用声光调Q可调谐线偏振CO2脉冲激光器,在250 Hz重频脉冲下以共线oo-e相位匹配方式作用于GaSe晶体,得到CO2激光的可调谐SHG输出。测量了基频波长为9.3、9.6、10.3和10.6μm时的相位匹配角,并通过对比现有文献中色散方程的相位匹配角计算结果和测量结果,确定出最适用于GaSe晶体的色散方程。实验对SHG信号与晶体中光束方位角φ的关系进行测量。本文实验可以作为间接测量晶体色散关系的方法,为GaSe晶体的进一步研究打下基础;同时也可为其它非线性晶体的研究提供参考。更多还原

【Abstract】 Second harmonic generation(SHG) and dispersion properties of GaSe crystal are researched by a polarized and tunable,acoustic-optically Q switched CO2 laser.With 250 Hz repeated frequency and collinearly oo-e phase matching type,the experiment realizes the second harmonic generation in GaSe crystal and measures the external phase matching angle θm in four fundamental wavelengths:9.3,9.6,10.3 and 10.6 μm.According to the comparison between θm measured and calculated results based on available GaSe dispersion equations,the most suitable dispersion equation for this GaSe sample in the experiment is determined.Besides,the relationship between SHG output and fundamental frequency azimuth angle φ is measured.So this experiment can be a way to determine the GaSe optimum dispersion equations,and be ground work for GaSe sample′s further research.更多还原