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Proceedings Paper

Optimization of the optical near-field distribution of metal multilayer dielectric gratings for pulse compressors
Author(s): Heyuan Guan; Yunxia Jin; Shijie Liu; Fanyu Kong; Yin Du; Kai He; Ming Fang; Kui Yi; Jianda Shao
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Paper Abstract

Metal multilayer dielectric gratings (MMDGs) for pulse compressors used in high-energy laser systems should enable high efficiency, as well as provide broad bandwidths and high laser-induced damage thresholds. The non-uniform optical near-field distribution of MMDGs is an important factor that limits damage resistance capabilities. The efficiency and electric field distributions of MMDGs with a corrugated SiO2 layer and operated at 800 nm are analyzed by rigorous coupled-wave analysis. The maximum electric field in the grating ridge, match layer, and metal layer decreases with increasing grating diffraction efficiency. High efficiency and a low electric field are obtained with a 90° slope angle in the grating ridge. The bandwidth and maximum electric field in the metal layer decrease with increasing high- and low-index material pairs, and the maximum electric fields in the grating ridge and match layer initially decrease and then increase. The peak electric field in the grating is optimized with a merit function; the optimization covers the enhancement of diffraction efficiency, bandwidth, and reduction of electric field. The bandwidth of the optimized MMDGs is 160 nm with a diffraction efficiency exceeding 90%. The largest electric field is modulated in air to obtain a low electric field and high laser-induced damage threshold.

Paper Details

Date Published: 9 July 2013
PDF: 8 pages
Proc. SPIE 8786, Pacific Rim Laser Damage 2013: Optical Materials for High Power Lasers, 878610 (9 July 2013); doi: 10.1117/12.2019443
Show Author Affiliations
Heyuan Guan, Shanghai Institute of Optics and Fine Mechanics (China)
Univ. of Chinese Academy of Sciences (China)
Yunxia Jin, Shanghai Institute of Optics and Fine Mechanics (China)
Shijie Liu, Shanghai Institute of Optics and Fine Mechanics (China)
Fanyu Kong, Shanghai Institute of Optics and Fine Mechanics (China)
Yin Du, Shanghai Institute of Optics and Fine Mechanics (China)
Kai He, Shanghai Institute of Optics and Fine Mechanics (China)
Ming Fang, Shanghai Institute of Optics and Fine Mechanics (China)
Kui Yi, Shanghai Institute of Optics and Fine Mechanics (China)
Jianda Shao, Shanghai Institute of Optics and Fine Mechanics (China)


Published in SPIE Proceedings Vol. 8786:
Pacific Rim Laser Damage 2013: Optical Materials for High Power Lasers
Jianda Shao; Takahisa Jitsuno; Wolfgang Rudolph, Editor(s)

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