自由电子激光放大啁啾脉冲的数值模拟
Numerical simulations of chirped pulse amplification at FEL
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摘要: 利用1维非定态程序对单程自由电子激光(FEL)放大器放大线性啁啾脉冲的过程进行了数值模拟，得到了不同啁啾参数的脉冲通过FEL放大器的增益曲线，计算了不同啁啾参数的脉冲被单程FEL放大器放大后的腔外压缩情况。通过对数值模拟结果的定性分析得出：影响输出脉冲宽度和峰值功率的主要因素是FEL放大器的增益线宽和啁啾参数，并以此说明，通过先使用FEL放大器放大啁啾脉冲、然后再将其在腔外压缩的方法产生超短脉冲FEL是可行的。Abstract: Linear chirped pulse amplification at single pass free-electron laser（FEL） amplifier has been performed by means of the modified 1D time-dependent FEL code，and the averaged output power of pulses as functions of undulator length at different chirped parameters is given through numerical simulations．The peak power and width of the final compressed pulse with different chirped parameters have been computed．The results of numerical stimulations show that the peak power and width of the final compressed pulse are influenced mainly by the chirped parameter and the FEL bandwidth，and compressing the pulse amplified by single pass FEL is a feasible means of producing ultra short FEL pulses．
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Key words:
- free-electron laser /
- amplifier /
- chirped pulse /
- numerical stimulations
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