Density modulation produced by ultrashort laser pulses and the phase reflection induced in underdense plasmas

Author:

Zhang Qiu-Ju ,Sheng Zheng-Ming ,Cang Yu ,Zhang Jie ,

Abstract

It is shown theoretically and by particle-in-cell simulations that the interferi ng fields of the incident and reflected laser pulses can produce deep plasma den sity modulations in underdense pre-plasmas.This occurs within a few tens of lase r cycles if the incident laser pulse is at moderate intensities such as 10 15W/cm2Such density modulations can serve as a Bragg reflector ,which results in phase reflection from underdense plasmas.Because the deep dens ity modulations are just a period of half a wavelength in the plasma,the reflec ted wave reaches the maximum by resonance with a reflectivity up to near 100%.T he phase reflection can also be observed from the plasma with a linear density p rofile,which can significantly reduce the laser absorption by fusion targets.

Publisher

Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences

Subject

General Physics and Astronomy

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