5 September 2006 Near field analysis of CSG and BSG combined element under high power laser condition
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In high power laser system, it is of great interest to combine two or more diffractive structures, in particular, the beam-sampling gratings (BSG) and the color separation gratings (CSG), onto one element. However, the combined element with diffractive structure on both surfaces, may cause serious laser induced damage to the element itself. So, this paper use Fourier modal method to analyze the near field characteristic of CSG and BSG combined element. Through theoretically analysis and numerical calculation, amplitude and phase distribution of electric field are present both inside and outside the diffractive structural region, and the maximum peak-to-average modulation in near field is also given. Based on this study, the most possibility of optical damage induced by beam modulation of CSG and BSG combined element appears in the neighborhood of the interface.
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Xin Yao, Xin Yao, Fuhua Gao, Fuhua Gao, Yixiao Zhang, Yixiao Zhang, Lei Wang, Lei Wang, Yongkang Guo, Yongkang Guo, Xi Hou, Xi Hou, } "Near field analysis of CSG and BSG combined element under high power laser condition", Proc. SPIE 6289, Novel Optical Systems Design and Optimization IX, 628911 (5 September 2006); doi: 10.1117/12.679770; https://doi.org/10.1117/12.679770

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