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The diode array light is guided to the amplifier through multiple reflections within a hollow, highly reflective metal lens duct and a parallel plate homogenizing structure. 0191 um (7x) Figure 2. 0922 micron wavefront distortion. The overall architecture employs a 5 mrad angularly multiplexed, four-pass beam layout. Image relaying of the laser beam with telescopes between the amplifiers helps to greatly reduce the intensity modulation at the crystalline amplifiers. An average-power, birefringence-compensated Pockels cell [3] is inserted after two passes at low fluence (<1 J/cm2) to help suppress the energy buildup of any parasitic beams.

M. Skoric3, T. Sato4 1 Institute of Applied Physics and Computational Mathematics, Beijing, China The Graduate University for Advanced Studies and National Institute for Fusion Science, Toki, Gifu, Japan 3 Vinca Institute of Nuclear Sciences, Belgrade, Serbia and Montenegro 4 Earth Simulator Center, JAMSTEC, Yokohama-shi, Japan 2 Abstract: Electron acceleration by intense laser beam interaction with an under-dense plasma layer was examined by particle simulations. A novel phenomenon of short high-quality, well-collimated return relativistic electron beam was observed in the direction opposite to laser propagation.

Física Aplicada, Universidad de Alicante, Spain 5 Lawrence Livermore National Laboratory, California, United States of America 6 Physics Department, University of Nevada, Reno, Nevada, United States of America 2 Abstract. New results of the jet-driven ignition target are presented, both with direct and indirect drive. This target is based on the conical guided target used in fast ignition but uses only one laser pulse. The ignition of the target is started by the impact of a jet produced in the guiding cone, instead of using charged particles generated by another high-power laser.