Abstract
Relativistic femtosecond mid-infrared pulses can be generated efficiently by laser interaction with near-critical-density plasmas.It is found theoretically and numerically that the radiation pressure of a circularly polarized laser pulse first compresses the plasma electrons to form a dense flying mirror with a relativistic high speed.The pulse reflected by the mirror is red-shifted to the mid-infrared range.Full three-dimensional simulations demonstrate that the central wavelength of the mid-infrared pulse is tunable from 3 μm to 14 μm,and the laser energy conversion efficiency can reach as high as 13％.With a 0.5-10 PW incident laser pulse,the generated mid-infrared pulse reaches a peak power of 10-180 TW,which is interesting for various applications in ultrafast and high-field sciences.
基金项目
National Natural Science Foundation of China(12375244)
National Natural Science Foundation of China(12135009)
National Natural Science Foundation of China(12275356)
Hunan Provincial Innovation Foundation for Postgraduate(CX20210062)
Hunan Provincial Innovation Foundation for Postgraduate(CX20230006)
维普
万方数据