激光波形优化产生水窗区单阶谐波

Optimization of laser waveform for generating water window single order harmonic

通过激光波形调控,理论提出一种获得水窗区间单阶谐波的方法.研究表明,在双色激光场中适当引入啁啾调制可获得强度增强一个数量级的单阶谐波.随后,在啁啾波形处适当引入半周期激光场可使单阶谐波进一步向高能区延伸,进而覆盖整个水窗区间.最后,在不同啁啾场以及半周期场的组合下可获得波长可调的水窗区间单阶谐波.

Based on the laser waveform control scheme,we propose a method to obtain the water window single order harmonic.The results show that by properly introducing the chirps of two-color laser field,the single order harmonic with the intensity enhancement of one order of magnitude can be obtained.Furthermore,by introducing a half-cycle pulse at the chirped waveform region,the single order harmonic can be extended to the higher energy region,covering the whole water window region.Finally,with the different combinations of chirped pulses and half-cycle pulses,the wavelength tunable single order harmonic in the water window region can be obtained.