Open AccessImprovement of the focusing ability by double deformable mirrors for 10-PW-level Ti: sapphire chirped pulse amplification laser system
Author(s) -
Zhen Guo,
Lianghong Yu,
JianYe Wang,
Cheng Wang,
Yanqi Liu,
Zebiao Gan,
Wenqi Li,
Yuxin Leng,
Xiaoyan Liang,
Ruxin Li
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.026776
Subject(s) - optics , deformable mirror , full width at half maximum , laser , ultrashort pulse , chirped pulse amplification , materials science , amplifier , beam (structure) , focal length , streak camera , laser beam quality , parabolic reflector , adaptive optics , physics , optoelectronics , laser beams , lens (geology) , cmos
Double deformable mirrors (DMs) with different actuator densities are cascaded to optimize the wavefront aberrations to improve the focus intensity of the Shanghai super-intense ultrafast laser facility (SULF), which plans to generate 10 PW laser pulse. The beam aberrations near the focal spot are corrected from 0.556 um to 0.112 um in RMS by a 300-mm DM with a large stroke installed after the compressor. After then, it is further optimized to 0.041 um using a 130-mm DM with a high spatial resolution working after the main amplifier. The corrected beam is focused to 2.75 × 2.87 um 2 at the full width at half maximum (FWHM) with an f/2.5 off-axis parabolic mirror (OAP), which contains approximately 27.69% energy. A peak intensity of 2 × 10 22 W/cm 2 is achieved at the output of 5.4 PW, and it could exceed 10 23 W/cm 2 in the SULF 10 PW laser facility using an f/1.8 OAP.