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Improving of the irradiation uniformity on targets with a diffraction-weakened lens array and spectral dispersion smoothing

Zhu Jian Jiang Xiu-Juan Zhou Shen-Lei Lin Zun-Qi

Improving of the irradiation uniformity on targets with a diffraction-weakened lens array and spectral dispersion smoothing

Zhu Jian, Jiang Xiu-Juan, Zhou Shen-Lei, Lin Zun-Qi
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  • Abstract views:  4097
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Publishing process
  • Received Date:  07 January 2006
  • Accepted Date:  27 March 2006
  • Published Online:  20 November 2006

Improving of the irradiation uniformity on targets with a diffraction-weakened lens array and spectral dispersion smoothing

  • 1. (1)中国工程物理研究院上海激光等离子体研究所,上海 201800; (2)中国科学院上海光学精密机械研究所高功率激光物理国家实验室,上海 201800

Abstract: A scheme employing a lens array and the technique of smoothing by spectral dispersion is presented for uniform irradiation on targets in inertial confinement fusion. Quasi-near field spots with a profile of sharp edge and flat top can be obtained with a diffraction-weakened lens array, while the speckles imposed on the spot by beamlets interference can be smoothed by spectral dispersion. Simulation results indicate that this scheme is a good candidate for improving the irradiation uniformity. The dependence of the smoothing performance on the characteristics of phase modulation and dispersion is further discussed, and it is found that parameters of the system of spectral dispersion and lens array must be chosen carefully to make optimal compromise between uniformity and usable energy of the laser beam.

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