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根据ffner展宽器的原理和设计,进行了光学参量啁啾脉冲放大系统中信号光脉冲展宽的实验研究。通过数值方法,合理地选择了展宽器光学元件的各项参数,即光栅常数为1 800(102 mm×102 mm),凹面镜曲率半径为1 000 mm,凸面镜与凹面镜之间的距离为653 mm,信号光入射角为51.05°。实验结果表明,优化后的ffner展宽器可以将脉宽为30 fs的信号光脉冲展宽到545 ps,展宽比为18 167,满足OPCPA放大的需要。
According to the principle and design of ffner stretcher, experimental research on signal pulse broadening in optical parametric chirped pulse amplification system is carried out. By numerical method, the parameters of the optical element of the stretcher are reasonably selected, that is, the grating constant is 1 800 (102 mm × 102 mm), the radius of curvature of the concave mirror is 1 000 mm, the distance between the convex mirror and the concave mirror is 653 mm, signal light incident angle of 51.05 °. The experimental results show that the optimized ffner stretcher can broaden the signal light pulse with a pulse width of 30 fs to 545 ps and the aspect ratio of 18 167, which meets the requirement of OPCPA amplification.