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针对在808 nm波段的光参量放大系统(OPA),详细分析了氘化磷酸二氢钾(DKDP)晶体非共线相位匹配的非线性过程。通过数值计算,给出了不同氘化率的DKDP晶体参量匹配特性以及匹配参数;在此基础上,利用OPA耦合波方程组分析了基于氘化率为95%的DKDP晶体的光参量啁啾脉冲放大器(OPCPA)的输出特性。结果显示,对大于30 fs压缩脉宽的超短脉冲激光系统,氘化率为90%以上的DKDP晶体具有足够的增益带宽与能量提取效率,但接收角较小,增加了工程调节难度。
Aiming at the optical parametric amplification system (OPA) at 808 nm, the nonlinear process of non-collinear phase matching of deuterated potassium dihydrogen phosphate (DKDP) crystals is analyzed in detail. By numerical calculation, the parameter matching characteristics and matching parameters of DKDP crystals with different deuteration rates are given. Based on the OPA coupling wave equations, the optical parametric chirp pulses based on DKDP crystals with deuteration rate of 95% Amplifier (OPCPA) output characteristics. The results show that DKDP crystals with more than 90% deuteration rate have sufficient gain bandwidth and energy extraction efficiency for ultrashort pulsed laser systems with compression pulse width greater than 30 fs, but the acceptance angle is small, which increases the engineering difficulty.