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在设计宽带光学参变啁啾脉冲放大系统时,对色散源进行了理论分析和讨论。对光学参变啁啾脉冲放大系统的色散量以及各个过程中的高阶色散对脉冲时域和频域特性的影响进行了计算。结果表明展宽器引入了非常大的色散,放大器中信号光相位变化产生的色散较大,参量晶体本身引入的色散相对较小可以忽略不计。输出脉冲宽度主要受二阶色散影响,而三阶和四阶色散主要影响脉冲的波形和信噪比,对频域影响很小。
In the design of broadband optical parametric chirped pulse amplification system, the theory of dispersion sources is discussed and discussed. The chromatic dispersion of optical parametric chirped pulse amplification system and the influence of high-order dispersion in each process on the characteristics of pulse time-domain and frequency-domain are calculated. The results show that a very large dispersion is introduced into the stretcher, the dispersion of the signal light phase change in the amplifier is large, and the relatively small dispersion introduced by the parametric crystal itself is negligible. The output pulse width is mainly affected by the second-order dispersion, while the third-order and the fourth-order dispersion mainly affect the waveform and signal-to-noise ratio of the pulse, which has little influence on the frequency domain.