1 May 2015 Optimization design of pulse compression multilayer dielectric gratings
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The pulse compression multilayer dielectric grating (MDG) is one of the key elements of high-power laser systems. Mixed metal multilayer dielectric gratings(MMDG) with wider spectrum and higher diffraction efficiency are gradually becoming hot topic in chirped pulse compressor. In this paper, we studied the reflection and diffraction characteristics of pulse compression grating, i.e MMDG. First the thin-film structure, which would be applied to MMDG, was designed by combining characteristic matrix method and global optimization algorithm and the influence of the metal thickness and the number of layer film to reflectivity was also analyzed. Grating design software based on reflectivity vector theory (RCW)was developed to analyze the diffraction characteristic of MMDG. Combining generic algorithm and RCW, the optimization design of MMDG is studied. Comparing the diffraction efficiency of before and after optimization design, the highest diffraction efficiency is higher than 99% and bandwidth of MMDG is over 200nm, 50nm wider than that of MDG.
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Shuwei Fan, Shuwei Fan, Liang Bai, Liang Bai, Shenli Jia, Shenli Jia, "Optimization design of pulse compression multilayer dielectric gratings", Proc. SPIE 9516, Integrated Optics: Physics and Simulations II, 95160Z (1 May 2015); doi: 10.1117/12.2175499; https://doi.org/10.1117/12.2175499

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