title: Dynamics of laser-driven proton acceleration exhibited by measured laser absorptivity and reflectivity.
abstract: Proton acceleration from nanometer thin foils with intense laser pulses is investigated experimentally. We analyzed the laser absorptivity by parallel monitoring of laser transmissivity and reflectivity with different laser intensities when moving the targets along the laser axis. A direct correlation between laser absorptivity and maximum proton energy is observed. Experimental results are interpreted in analytical estimation, exhibiting a coexistence of plasma expansion and light-sail form of radiation pressure acceleration (RPA-LS) mechanisms during the entire proton acceleration process based on the measured laser absorptivity and reflectivity.
authors.affiliation: Fakultät für Physik, Ludwig-Maximilians-Universität München, D-85748 Garching, Germany.|Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany.
authors.forename: J H
authors.initials: JH
authors.lastname: Bin
authors.affiliation: Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany.
authors.forename: K
authors.initials: K
authors.lastname: Allinger
authors.affiliation: Fakultät für Physik, Ludwig-Maximilians-Universität München, D-85748 Garching, Germany.
authors.forename: K
authors.initials: K
authors.lastname: Khrennikov
authors.affiliation: Fakultät für Physik, Ludwig-Maximilians-Universität München, D-85748 Garching, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Karsch
authors.affiliation: Fakultät für Physik, Ludwig-Maximilians-Universität München, D-85748 Garching, Germany.
authors.forename: P R
authors.initials: PR
authors.lastname: Bolton
authors.affiliation: Fakultät für Physik, Ludwig-Maximilians-Universität München, D-85748 Garching, Germany.|Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Schreiber