相位失配法实现倍频稳定输出的模拟分析
Numerical simulation of stable second harmonic generation using phase mismatching
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摘要: 对BBO晶体Ⅰ类相位匹配倍频过程和KTP晶体XY平面内的Ⅱ类相位匹配倍频过程进行数值模拟，结果表明：Ⅰ类和Ⅱ类相位匹配倍频过程，都可通过引入适量的相位失配量实现稳定倍频输出；随着相位失配量的增大，实现稳定倍频输出所需的晶体长度都变小，倍频稳定输出起伏变小，倍频转换效率有不同程度的下降；相对于XY平面内的Ⅱ类相位匹配倍频过程，BBO晶体的Ⅰ类相位匹配倍频过程对相位匹配偏离角更敏感，且稳定输出时倍频转换效率更低。Abstract: A method is put forward to stabilize the second harmonic generation using phase mismatching. BBO type Ⅰ phase matching SHG course and KTP type Ⅱ phase matching course were simulated. Simulation results show that both type Ⅰ and type Ⅱ phase matching can get 2ω stable output by letting laser deviate from phase matching angle. With the increasement of the deviating angle, the length of the nonlinear crystal required to get stable 2ω output reduces, the fluctuation and the conversion efficiency of second harmonic generation output when the stable 2ω output is obtained become smaller. Compared with KTP type Ⅱ phase matching, BBO type Ⅰ phase matching is more sensitive to deviating angle and the conversion efficiency is smaller.
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Key words:
- phase mismatching /
- second harmonic generation /
- deviating angle /
- bbo crystal /
- numerical simulation
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