title: Electron density compression and oscillating effects on laser energy absorption in overdense plasma targets.
abstract: An analytical model for energy absorption during the interaction of an ultrashort, ultraintense laser with an overdense plasma is proposed. Both the compression effect of the electron density profile and the oscillation of the electron plasma surface are self-consistently included, which exhibit significant influences on the laser energy absorption. Based on our model, the general scaling law of the compression effect depending on laser strength and initial density is derived, and the temporal variation of the laser absorption due to the boundary oscillating effect is presented. It is found that due to the oscillation of the electron plasma surface, the laser absorption rate will vibrate periodically at ω or 2ω frequency for the p-polarized and s-polarized laser, respectively. The effect of plasma collision on the laser absorption has also been investigated, which shows a considerable rise in absorption with increasing electron-ion collision frequency for both polarizations.
authors.affiliation: College of Science, National University of Defense Technology, Changsha 410073, P. R. China.
authors.forename: Z Y
authors.initials: ZY
authors.lastname: Ge
authors.affiliation: College of Science, National University of Defense Technology, Changsha 410073, P. R. China.
authors.forename: H B
authors.initials: HB
authors.lastname: Zhuo
authors.affiliation: Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, P. R. China.
authors.forename: W
authors.initials: W
authors.lastname: Yu
authors.affiliation: College of Science, National University of Defense Technology, Changsha 410073, P. R. China.
authors.forename: X H
authors.initials: XH
authors.lastname: Yang
authors.affiliation: College of Science, National University of Defense Technology, Changsha 410073, P. R. China.
authors.forename: T P
authors.initials: TP
authors.lastname: Yu
authors.affiliation: College of Science, National University of Defense Technology, Changsha 410073, P. R. China.
authors.forename: X H
authors.initials: XH
authors.lastname: Li
authors.affiliation: College of Science, National University of Defense Technology, Changsha 410073, P. R. China.
authors.forename: D B
authors.initials: DB
authors.lastname: Zou
authors.affiliation: College of Science, National University of Defense Technology, Changsha 410073, P. R. China.
authors.forename: Y Y
authors.initials: YY
authors.lastname: Ma
authors.affiliation: College of Science, National University of Defense Technology, Changsha 410073, P. R. China.
authors.forename: Y
authors.initials: Y
authors.lastname: Yin
authors.affiliation: College of Science, National University of Defense Technology, Changsha 410073, P. R. China.
authors.forename: F Q
authors.initials: FQ
authors.lastname: Shao
authors.affiliation: Institute of Applied Physics and Computational Mathematics, Beijing 100088, P. R. China.
authors.forename: X J
authors.initials: XJ
authors.lastname: Peng