title: Absorption of short laser pulses on solid targets in the ultrarelativistic regime.
abstract: We report the first direct measurements of total absorption of short laser pulses on solid targets in the ultrarelativistic regime. The data show an enhanced absorption at intensities above 10(20) W/cm(2), reaching 60% for near-normal incidence and 80%-90% for 45 degrees incidence. Two-dimensional particle-in-cell simulations demonstrate that such high absorption is consistent with both interaction with preplasma and hole boring by the intense laser pulse. A large redshift in the second harmonic indicates a surface recession velocity of 0.035c.
authors: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
authors: Y
authors: Y
authors: Ping
authors: R
authors: R
authors: Shepherd
authors: B F
authors: BF
authors: Lasinski
authors: M
authors: M
authors: Tabak
authors: H
authors: H
authors: Chen
authors: H K
authors: HK
authors: Chung
authors: K B
authors: KB
authors: Fournier
authors: S B
authors: SB
authors: Hansen
authors: A
authors: A
authors: Kemp
authors: D A
authors: DA
authors: Liedahl
authors: K
authors: K
authors: Widmann
authors: S C
authors: SC
authors: Wilks
authors: W
authors: W
authors: Rozmus
authors: M
authors: M
authors: Sherlock