光参量啁啾脉冲放大中时间同步抖动对增益稳定性的影响
Effects of synchronization-time jitter in optical parametric chirped-pulse amplification on gain stability
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摘要: 在考虑了光参量啁啾脉冲放大中的脉冲波形、相位失配和时间同步抖动情况下，给出了计算光参量啁啾脉冲放大增益特性更为完善的三波耦合理论模型。并在1 ns的时间同步抖动情况下，对比分析了光参量放大在小信号放大及饱和放大时的增益稳定性。光参量放大的时间同步抖动对增益影响非常大,使放大信号光脉冲的增益光谱发生了明显的偏移，波形不对称和整个增益降低；并且信号光光谱越宽，光参量放大间的时间同步抖动对其增益影响越严重；但随着参量放大增益饱和的出现和加深，信号光和抽运光之间的同步时间抖动对放大信号光的输出强度影响减弱，即在饱和放大处可以获得更稳定的放大信号光输出。Abstract: An improved three-wave-coupling model of optical parametric chirped pulse amplification（OPCPA） including the effects of phase mismatching, pulse temporal profile and synchronization-time jitter was presented in this paper. With the model, we investigated and compared the effect of synchronization-time jitter on the gain stability of OPCPA in small signal amplification regime and in saturation regime respectively. The results show that in the case of one nanosecond synchronization-time jitter, the jitter shifts the amplified signal gain spectrum obviously, leads to pulse profile asymmetry and decreases the gain overall. The broader signal spectrum will aggravate the influence of jitter on parametric gain. However, when the parametric amplification is saturated, the impact of jitter upon o
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