光纤激光器光参量啁啾脉冲放大现象

Control of Superfluorescence for the Optical Parametric Chirped Pulse Amplifier Based on Fiber Laser

实验研究了采用信号光在一块非线性晶体内被同一束泵浦光放大两次的结构来实现光参量啁啾脉冲放大过程中对参量荧光的控制,实验得到了2×106的双通总增益,输出总能量为2mJ,信号光能量晃动小于3%rms,此时参量荧光仅占输出总能量的1%.采用这种放大结构,提高了短信号光与长泵浦光在时域上的匹配和转换效率,抑制了参量荧光,并提高了放大信号光的能量稳定性.

By using a novel double-pass optical parametric chirped pulse amplifier in a single nonlinear crystal,control of the superfluorescence was studied for the optical parametric chirped pulse amplifier based on fiber laser. Net saturated gain of 2 × 10^6 has been achieved and the superfluorescence is obviously decreased to less than 1% of the total output pulse energy when the signal is amplified to 2 mJ with rms fluctuations of less than 3% which is saturated after the amplifier. By this scheme, the superfluorescence is effectivly constrained and the stability of the signal is greatly increased.