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利用低温工作状态下Yb∶YAG再生放大器,对1030nm光纤锁模激光器输出的250pJ的种子光进行放大。电光开关门宽控制种子光在放大器内20程往返,最大单脉冲能量为217μJ,输出频率10Hz,同时由于其增益窄化效应光谱宽度由8.9nm减小到0.3nm,相应的脉宽由18.0ps被压缩到5.5ps,这与理论模拟结果的0.4nm,4.2ps基本吻合。实验结果论证了采用窄增益带宽的再生放大器可以同时实现亚皮秒光参量啁啾脉冲放大(OPCPA)对抽运脉冲宽度和光谱宽度的要求,避免使用光纤光栅对光谱滤波带来的高阶非线性效应。
The low-temperature Yb: YAG regenerative amplifier is used to amplify the 250pJ seed light output by the 1030nm fiber mode-locked laser. Electro-optic switch width control seed light in the amplifier 20-way round trip, the maximum single-pulse energy of 217μJ, the output frequency of 10Hz, while narrowing the gain due to its narrow spectral width effect from 8.9nm to 0.3nm, the corresponding pulse width by 18.0ps Was compressed to 5.5ps, which is basically consistent with theoretical simulation results of 0.4nm, 4.2ps. Experimental results demonstrate that the regenerative amplifier with narrow gain bandwidth can simultaneously achieve the requirements of sub-picosecond optical parameter chirped pulse amplification (OPCPA) on the pulse width and spectral width of the pump, and avoid using high-order non-linear filtering caused by spectral filtering Linear effect.