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针对啁啾脉冲放大技术建成的钛宝石激光装置,提出一种获得高重复率激光脉冲列的方法.通过改变钛宝石再生放大器中泡克耳斯盒电光开关的传统工作模式,使得腔内放大的脉冲从某特定时刻起,每当在腔内往返一次就以一定的倒出比例(倒出率)倒出腔内脉冲能量的一部分,从而可以在有限的时间段内产生高重复率的啁啾激光脉冲列.基于Franz-Nodvik放大理论,建立了该高重复率再生放大器的理论模型,通过数值计算,系统地分析了初始增益、倒出时刻、倒出率对输出的脉冲序列的影响.在抽运功率为35mJ、倒出率为1/2的实验条件下,通过腔外的脉冲数量选择器,在一个抽运周期内的有限时间段内已获得了14个幅度相近、单脉冲能量约为0.02mJ、重复率为100MHz的啁啾脉冲序列.从此啁啾脉冲列中选取数个脉冲,通过10TW级的激光系统放大和压缩,已获得100MHz重复率的飞秒太瓦级脉冲列.
Aiming at the Ti: sapphire laser device built by chirped pulse amplification technology, a method of obtaining laser pulse train with high repetition rate is proposed. By changing the traditional working mode of the electro-optic switch of Pockels box in Ti: GaAs regenerative amplifier, Pulses from a particular moment, every time in the cavity back and forth to a certain proportion of the rate of pouring (pouring rate) poured out of the cavity part of the pulse energy, which can be generated within a limited period of time high repetition rate chirp Based on the Franz-Nodvik amplification theory, the theoretical model of the high repetition rate regenerative amplifier is established. By numerical calculation, the influence of initial gain, pour-out time and pour-out rate on the output pulse sequence is systematically analyzed. Pumping power of 35mJ, the rate of discharge of 1/2 experimental conditions, the number of pulses through the cavity selector, in a pumping period within a limited period of time has been 14 similar amplitude, single pulse energy of about For the 0.02mJ, repetition rate of 100MHz chirp pulse sequence selected from the chirped pulse train selected a few pulses through 10TW laser system amplification and compression, has been 100MHz repetition rate femtotecond watts Pulse train.