Optimization of laser waveform for generating water window single order harmonic

Abstract:

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.