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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。
In order to study the frequency-doubled (SHG) and dispersion properties of GaSe crystals, an acousto-optic Q-switched tunable linear polarized CO2 pulsed laser was used to effect GaSe crystals in a co-linear oo-e phase matching mode at a repetition rate of 250 Hz to obtain CO2 Laser tunable SHG output. The phase matching angles were measured at the fundamental frequency of 9.3, 9.6, 10.3 and 10.6 μm. By comparing the results of the phase matching angle and the measurement results of dispersion equations in the existing literature, the dispersion equation suitable for GaSe crystals was determined. The relationship between the SHG signal and the azimuth angle φ of the crystal in the crystal was experimentally measured. This experiment can be used as an indirect method to measure the relationship between the crystal dispersion and lay the foundation for the further study of GaSe crystals. At the same time, it can also provide reference for the study of other nonlinear crystals.