Optimization of the optical near-field distribution of metal multilayer dielectric gratings for pulse compressors

Heyuan Guan; Yunxia Jin; Shijie Liu; Fanyu Kong; Yin Du; Kai He; Ming Fang; Kui Yi; Jianda Shao

doi:10.1117/12.2019443

9 July 2013 Optimization of the optical near-field distribution of metal multilayer dielectric gratings for pulse compressors

Heyuan Guan, Yunxia Jin, Shijie Liu, Fanyu Kong, Yin Du, Kai He, Ming Fang, Kui Yi, Jianda Shao

Author Affiliations +

Proceedings Volume 8786, Pacific Rim Laser Damage 2013: Optical Materials for High Power Lasers; 878610 (2013) https://doi.org/10.1117/12.2019443
Event: SPIE/SIOM Pacific Rim Laser Damage: Optical Materials for High-Power Lasers, 2013, Shanghai, China

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.

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Heyuan Guan, Yunxia Jin, Shijie Liu, Fanyu Kong, Yin Du, Kai He, Ming Fang, Kui Yi, and Jianda Shao "Optimization of the optical near-field distribution of metal multilayer dielectric gratings for pulse compressors", Proc. SPIE 8786, Pacific Rim Laser Damage 2013: Optical Materials for High Power Lasers, 878610 (9 July 2013); https://doi.org/10.1117/12.2019443

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KEYWORDS

Diffraction

Diffraction gratings

Metals

Dielectrics

Near field optics

Near field

Laser induced damage

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