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Proceedings Paper

A method of aberration measurement and correction for entire beam path of ICF beam path
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Paper Abstract

In an inertial confinement fusion (ICF) system, wave-front aberrations existed in laser beam will enlarge the focal spot size and decrease power density at the target. Fortunately, an adaptive optical system (AO) could be employed in ICF system to correct the beam aberrations. As a powerful wave-front detector, Hartmann-Shack (H-S) sensor is often utilized as a wave-front sensor in AO. However, H-S sensor can not detect the aberrations after the sampling location. A new method is presented to measure the aberrations of entire ICF beam path in this paper. Based on the AO, a CCD is installed in the target chamber to detect the focal spot distribution. The deformable mirror's (DM) is yielded to different surface shapes; the extra different aberrations are modulated and added to ICF beam path, and then create their corresponding focal spots. The extra aberrations and the corresponding focal spots intensity could be recorded simultaneously by H-S sensor and CCD respectively. An amendatory phase-retrieval algorithm which is introduced can reconstruct the aberrations of entire ICF beam path from the pairs of extra aberrations and their corresponding focal spots intensity. The numerical simulation show that the AO can correct the aberrations of entire beam path of ICF successfully based on this method.

Paper Details

Date Published: 6 February 2008
PDF: 8 pages
Proc. SPIE 6823, High-Power Lasers and Applications IV, 68230I (6 February 2008); doi: 10.1117/12.755454
Show Author Affiliations
MingWu Ao, Institute of Optics and Electronics (China)
Graduate School of Chinese Academy of Sciences (China)
Ping Yang, Institute of Optics and Electronics (China)
Graduate School of Chinese Academy of Sciences (China)
Zeping Yang, Institute of Optics and Electronics (China)
Ende Li, Institute of Optics and Electronics (China)
ChangHui Rao, Institute of Optics and Electronics (China)
Wenhan Jiang, Institute of Optics and Electronics (China)


Published in SPIE Proceedings Vol. 6823:
High-Power Lasers and Applications IV
Dianyuan Fan; Robert F. Walter, Editor(s)

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