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Improved uniformity of target illumination by combining a lens array and the technique of spectral dispersion

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3 Author(s)
Jiang, Xiujuan ; National Laboratory for High Power Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, P.O. Box 800-211, Shanghai 201800, China ; Zhou, Shenlei ; Lin, Zunqi

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A scheme using a lens array and the technique of spectral dispersion is presented to improve target illumination uniformity in laser produced plasmas. Detailed two-dimensional simulation shows that a quasi-near-field target pattern, of steeper edges and without side lobes, is achieved with a lens array, while interference stripes inside the pattern are smoothed out by the use of the spectral dispersion technique. Moving the target slightly from the exact focal plane of the principal focusing lens can eliminate middle-scale-length intensity fluctuation further. Numerical results indicate that a well-irradiated laser spot with small nonuniformity and great energy efficiency can be obtained in this scheme.

Published in:

Journal of Applied Physics  (Volume:101 ,  Issue: 2 )

Date of Publication:

Jan 2007

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