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要实现光参量啁啾脉冲放大(OPCPA)系统稳定、高质量输出,需要同时对光参量放大和泵浦光倍频这两个非线性过程进行优化设计。在光参量放大系统优化设计中,建立了描述光参量放大过程的多种简化物理模型;通过模拟泵浦光和信号光口径匹配关系,分析了放大信号光空间两维对称性并提出了优化方法;建立了非线性晶体最佳长度确定及调谐方法,以实现信号光输出高稳定性。在泵浦光倍频系统优化设计过程中,提出应用位相失配法实现稳定倍频输出,研究表明这种方法不仅能实现倍频光能量起伏抖动远远小于基频光能量的起伏抖动,而且能减小泵浦光近场调制度和时间波形调制,极大地改善输出倍频光光束质量,进而提高OPCPA系统输出信号光质量。
In order to realize the stable and high quality output of optical parametric chirped pulse amplification (OPCPA) system, it is necessary to optimize the two non-linear processes of optical parametric amplification and pump optical multiplication simultaneously. In the optimization design of optical parametric amplification system, a variety of simplified physical models describing the optical parametric amplification process are established. By simulating the matching relationship between the pump light and the signal light, the two-dimensional symmetry of the amplified signal light space is analyzed and an optimization method is proposed The optimal length of nonlinear crystals and the tuning method were established to achieve high stability of signal light output. In the process of optimizing the design of pump optical frequency doubling system, it is proposed to apply the phase mismatch method to achieve a stable multiplier output. The results show that this method can not only achieve the undulating jitter of octave optical energy much less than the fluctuation of fundamental frequency optical energy, Which can reduce the modulation of near-field modulation and time waveform of pump light, and greatly improve the quality of the output double-frequency optical beam, thereby improving the output signal light quality of the OPCPA system.