Chinese Journal of Lasers, Volume. 36, Issue 7, 1625(2009)
New Progress on Adaptive Optics in Inertial Confinement Fusion Facility
Adaptive optical wavefront control technique is an important means to improve the beam quality in the inertial confinement fusion (ICF) laser system. The new progress on adptive optics (AO) in ICF facility, including the 8 sets of AO systems for the “Shenguang Ⅲ” prototype facility, the development of the large aperture deformable mirror (DM) prototype with the replaceable actuators used in the future ICF systems, and the AO wavefront control technologies, are introduced. In the “Shenguang Ⅲ” prototype facility, the static aberrations of the entire optical system from the front-end to the target using the 8 sets of AO systems are successfully corrected and the focal spot intensity distributions in the target are improved. The improvement of the X-ray distributions after AO correction is observed. A large aperture DM prototype with 17 replaceable actuators, 284 mm×284 mm aperture size, more than ±6 μm stroke and 500 Hz resonant frequency is manufactured and tested. The stochastic parallel gradient descent (SPGD) algorithm based on the far-field focal spot intensity is tested and proven to be effective for the ICF facility.
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Jiang Wenhan, Yang Zeping, Guan Chunlin, Zhang Xiaojun, Rao Changhui, Zhang Yudong, Li Ende, Xu Hong, Huang Linhai, Fan Muwen, Shi Ningping. New Progress on Adaptive Optics in Inertial Confinement Fusion Facility[J]. Chinese Journal of Lasers, 2009, 36(7): 1625