The control of laser-plasma parametric instabilities and the temperature of suprathermal electrons with ultrabroad bandwidth frequency modulated laser pulse

The development of the capability of selectively exciting or suppressing a specific laser-plasma parametric instability will result in a better understanding on the rich interplay between laser-plasma instabilities, nonlinear wave collapse and strong turbulence; it is also very important to inertial confinement fusion target designs and other advanced applications. The progress in the development of ultraintense, ultrashort pulse lasers has allowed for the exploration of many new regimes in the field of laser-plasma interaction. In this paper, one of the possible applications of the ultrabroad bandwidth associated with these ultrashort laser pulses were explored. The behaviour of ultrabroad bandwidth frequency modulated (UBFM) laser excited simulated Raman scattering (SRS) was studied using a 1.5D electromagnetic particle-in-cell code. The results show that, according to the properties of parametric instability, one can already either enhance or reduce the intensity of selected instability for various applications by a readily available UBFM laser pulse. (author)