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高重复频率再生放大器的能量提取周期远小于激光增益介质上能级寿命,这会导致再生放大器输出一高一低两种能量的激光脉冲,即倍周期分叉现象。针对上述问题,从理论上分析高重复频率Nd…YVO_4再生放大器的输出脉冲稳定性与重复频率之间的关系,发现提高再生放大器重复频率可以避免出现倍周期分叉现象,并通过实验验证了当重复频率大于250kHz时,Nd…YVO_4再生放大器没有出现倍周期分叉现象。此外,在吸收抽运功率为70 W时,实现了对单脉冲能量为1nJ、重复频率为94MHz的全固态Nd…YVO_4晶体半导体可饱和吸收镜锁模种子激光脉冲的再生放大,得到重复频率可调(250~500kHz)的皮秒激光,其最大输出功率达到18 W,单脉冲能量为36μJ。
The energy extraction period of a high repetition rate regenerative amplifier is much shorter than that of a laser gain medium, which causes the regenerative amplifier to output laser pulses of high energy and low energy, that is, doubling period bifurcation. In view of the above problems, the relationship between the output pulse stability and the repetition frequency of a Nd: YVO_4 regenerative amplifier with high repetition frequency is theoretically analyzed. It is found that doubling period bifurcation can be avoided by increasing the repetition frequency of the regenerative amplifier. When the repetition frequency is more than 250kHz, there is no doubling period bifurcation in the Nd ... YVO_4 regenerative amplifier. In addition, when the pumping power is absorbed at 70 W, the regeneration amplification of the all-solid-state Nd: YVO 4 crystal semiconductor saturable absorption mode-locked seed laser pulse with a single pulse energy of 1 nJ and a repetition frequency of 94 MHz is achieved, Pitch (250 ~ 500kHz) picosecond laser, the maximum output power of 18 W, single pulse energy of 36μJ.