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Proceedings Paper

Multifunctional diffractive optics element for high-energy laser system
Author(s): Jinyu Wang; Yingbai Yan; Qiaofeng Tan; Guofan Jin
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Paper Abstract

A diffractive micro-optics element with hybrid functions has been designed to perform Inertial Confinement Fusion (ICF). The functions of a lens, a low efficiency beam sampler, a Color Separation Grating (CSG) and a binary optical element for target uniform illumination has been integrated to the diffractive optical element (DOE). Its phase distribution is continuous on a disk with diameter of 45mm. The focal length of element is 2400mm. Sampling efficiency for 3ω+(0.351um) light at +1 diffraction order is under 0.1% and the space between sampled beam and focal spot is more than 30mm on the target plane. Unwanted harmonic waves of fundamental wave (1ω+) at 1.053 um and second harmonic wave (2ω+) at 0.527 um are diverted out of the high power laser system and the remnant ratio of them at zero order are less than 2%. Meanwhile, the micro-optics element has excellent ability for beam uniform. The side lobe of the 3ω+ focal spot is suppressed very well and the root-mean-square percent error of its top uniformity is less than 1.5%. Although effected by focusing, beam sampling, color separating and beam smoothing, the synthetic efficiency of 3ω+ light is more than 96%. For the functions integrated diffractive micro-optics element, different designing methods have been applied to implement its corresponding aims. The compatibility, fabrication method and influences between the hybrid functions are discussed in detail.

Paper Details

Date Published: 19 October 2001
PDF: 11 pages
Proc. SPIE 4580, Optoelectronics, Materials, and Devices for Communications, (19 October 2001); doi: 10.1117/12.444985
Show Author Affiliations
Jinyu Wang, Tsinghua Univ. (China)
Yingbai Yan, Tsinghua Univ. (China)
Qiaofeng Tan, Tsinghua Univ. (China)
Guofan Jin, Tsinghua Univ. (China)

Published in SPIE Proceedings Vol. 4580:
Optoelectronics, Materials, and Devices for Communications
Tien Pei Lee; Qiming Wang, Editor(s)

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