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Proceedings Paper

Micro-optics element for color separating
Author(s): Jinyu Wang; Yingbai Yan; Qiaofeng Tan; Guofan Jin
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Paper Abstract

A micro-optics element has been designed for diverting unwanted harmonic waves out of high power laser system to perform Inertial Confinement Fusion (ICF). Based on scalar diffraction theory, a basic structure of color separation gratings (CSG) has been designed, which almost meets the request of ICF target system. To increase the diffraction efficiency of third harmonic wave at 0.351 micrometers and decrease that of fundamental wave at 1.053 micrometers and second harmonic at 0.527 micrometers , the basic CSG structure has been optimized by a hybrid algorithm based on simulated annealing algorithm and hill-climbing algorithm. During the optimization procedure, the freedom variable is the step width and step height in one period and the degree of freedom is totally four. By applying several different bounds for objective function, several optimized micro- optical structures have been obtained, which all meet requirements of ICF target system. The influences of step width errors, step height errors and mould collimating errors of the optimized CSG have been analyzed respectively. Among these schemes, a most ideal structure has been selected which is most insensitive to fabrication errors. Under given error limitation, the diffraction efficiency's root-mean-square value at zero order for selected CSG have been investigated by statistical method.

Paper Details

Date Published: 11 November 1999
PDF: 12 pages
Proc. SPIE 3897, Advanced Photonic Sensors and Applications, (11 November 1999); doi: 10.1117/12.369367
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. 3897:
Advanced Photonic Sensors and Applications
Robert A. Lieberman; Anand Krishna Asundi; Hiroshi Asanuma, Editor(s)

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