title: Beam wavefront control of a thermal inertia laser for inertial confinement fusion application.
abstract: A novel scheme to correct aberration of each beam from the front-end to the target point in a thermal inertia laser (TIL) is presented. Each beam contains a deformable mirror (DM) with an aperture of 70 mm x 70 mm at the injection of the main amplifier and a Hartman-Shack (HS) sensor in a parameter diagnostic unit (PDU). A temporary HS sensor for measuring the static aberration of each beam with 1 Hz source is placed at the target point. The sensor will be removed from the target point during the main single shot, so we transfer the results measured at the target point to the sensors in the PDU. Dynamic aberration can also be measured by the HS sensor in the PDU during the single shot. In this way, we need not calibrate the aberration of the PDU, and aberration of each beam can be corrected by the DM with the HS sensor in the PDU. We demonstrate that with this scheme the divergence angle of the TIL pulses can be improved from 100 to less than 60 murad with a focal length of 2200 mm and beam size of 290 mm x 290 mm, which meets the requirement of a TIL.
authors: Research Center of Laser Fusion, CAEP, P.O. Box 919-988, Mianyang 621900, China. dwj8wy@163.com
authors: Dai
authors: D
authors: Wanjun
authors: Hu
authors: H
authors: Dongxia
authors: Zhou
authors: Z
authors: Wei
authors: Zhao
authors: Z
authors: Junpu
authors: Jing
authors: J
authors: Feng
authors: Yang
authors: Y
authors: Zeping
authors: Zhang
authors: Z
authors: Kun
authors: Jiang
authors: J
authors: Xuejun
authors: Deng
authors: D
authors: Wu
authors: Zhao
authors: Z
authors: Runchang
authors: Peng
authors: P
authors: Zhitao
authors: Feng
authors: F
authors: Bin