Effects of Laser Wavelength on Interaction of Ultrashort Intense Laser with Finite-Scale Length Dense Plasmas

Abstract

The energetic electrons and ions generated by the interaction of an intense, ultrashort laser pulse with a finite scale-length dense plasma were investigated for various laser wavelengths using particle-in-cell simulation. The hot-electron temperature for the density scale-length L = 2.5 μm is not governed by the Iλ²-scaling laws, where I is the laser intensity and λ is the laser wavelength. The maximum energy of the energetic ions is not only proportional to the hot-electron temperature but depends on the electron density.