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为了获得2.15～1 500μm的相干光源,研究了CO激光在高质量非线性晶体ZnGeP2和GaSe中的混频效应。为了提高转换效率,在激光锁模方式下对CO激光器的二次谐波、和频和差频的产生进行了研究。结果显示,利用GaSe晶体和ZnGeP2晶体,调Q多谱线CO激光辐射的谱线内倍频效率分别大于0.3%和1.1%。采用ZnGeP2晶体进行倍频时,可调谐锁膜CO激光器的转换效率为12.5%。模拟结果显示,二次谐波与和频产生的输出光谱相同。相邻谱线下,和频和差频的产生过程中,基波和一次谐波可以分别在4.0～5.0μm和100～≥1 200μm(太赫兹范围)形成振荡。利用锁模CO激光器在ZnGeP2晶体中的混频效应,可以得到2.15～≥1 500μm的相干光源,同时转换效率可达到甚至高于12.5%。
In order to obtain the coherent light source of 2.15 ~ 1 500 μm, the mixing effect of CO laser in high quality nonlinear crystals ZnGeP2 and GaSe was studied. In order to improve the conversion efficiency, the second harmonics, sum frequency and difference frequency of CO laser were studied in the mode of laser clamping. The results show that the spectral doubling efficiency of Q-switched multispectral CO laser radiation is greater than 0.3% and 1.1%, respectively, using GaSe crystals and ZnGeP2 crystals. When ZnGeP2 crystal is used for frequency doubling, the tunable locking CO laser has a conversion efficiency of 12.5%. The simulation results show that the second harmonic produces the same output spectrum as the sum frequency. During the generation of sum frequency and difference frequency, the fundamental wave and the first harmonic can oscillate in the range of 4.0-5.0μm and 100-1.200μm (terahertz) respectively in the adjacent spectral lines. The use of mode-locked CO laser in ZnGeP2 crystal mixing effect, you can get 2.15 ~ ≥1 500μm coherent light source, while the conversion efficiency can reach or even higher than 12.5%.