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相位匹配是实现高效光学参变啁啾脉冲放大(OPCPA)能量转换的关键之一,通过对几种常用非线性晶体的光学参变啁啾脉冲放大过程进行数值模拟研究,结果表明一定程度的相位失配不但能增加光学参变啁啾脉冲放大增益带宽,而且会使啁啾脉冲光谱强度分布中间凹陷。提出利用光学参变啁啾脉冲放大相位失配放大作为啁啾脉冲频谱整形的新方法,通过理论分析和模拟计算,找到了光学参变啁啾脉冲放大相位失配啁啾脉冲频谱整形效果的控制量;并对几种常用非线性晶体在简并、近简并、非简并等条件下的光学参变啁啾脉冲放大相位失配放大特性进行了比较。
Phase matching is one of the key points to realize OPCPA energy conversion. By numerical simulations of the optical parametric chirped pulse amplification of several commonly used nonlinear crystals, the phase-matching results show that a certain degree of phase Mismatch not only increases the optical parametric chirped pulse amplification gain bandwidth, but also makes the chirped pulse spectral intensity distribution in the middle of depression. A new method to amplify the phase mismatch of optical parametric chirped pulse amplification is proposed as a new method for spectral shaping of chirped pulse. By theoretical analysis and simulation calculation, the control effect of optical parametric chirped pulse amplification phase mismatch chirped pulse shaping The magnitudes of phase mismatch of optical parametric chirped pulses in several degenerate, near-degenerated and non-degenerate crystals were compared.