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为研究限制啁啾脉冲放大(CPA)系统产生高能超短激光脉冲的可能因素,采用时间相关的非线性辐射迁移方程组描述掺镱光纤中脉冲的放大过程,并利用此模型分析了脉冲初始三阶色散(TOD)对脉冲经放大器传输后的功率增益特性的影响.数值结果表明,当入射脉冲能量相同时,初始TOD为0的脉冲放大后的输出峰值功率增益比具有正TOD的脉冲峰值功率增益小,却比TOD为负值的脉冲峰值功率增益大,并且增益值间的差别随脉冲初始能量的增大而增大.
In order to study the possible factors that limit the generation of high-energy and ultra-short laser pulses in a chirped pulse amplification (CPA) system, the time-dependent nonlinear radiation migration equations are used to describe the amplifying process of the pulses in the ytterbium-doped fiber. The effect of order dispersion (TOD) on the power gain characteristics of the pulsed amplifier is shown in Fig. 1. The numerical results show that when the energy of the incident pulse is the same, the output peak power gain of the pulsed amplified initial TOD is 0 higher than the peak power of the pulsed peak with positive TOD The gain is small but larger than the peak power gain of the pulse with a negative value of TOD, and the difference between gain values increases as the initial energy of the pulse increases.