9 November 2016 Design of high efficiency, broad bandwidth unpolarized transmission grating for femtosecond laser
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Abstract
An unpolarized fused silica transmission grating with 1250lp/mm applying in femtosecond laser has been designed at 780nm center wavelength with 740nm~840nm bandwidth. By using the rigorous coupled-wave theory, computer optimization shows that: when the groove depth and duty cycle are about 1.51um~1.63um, 0.53~0.63 respectively, the first-order diffraction efficiency of a lossless-transmission surface-relief grating with a rectangular surface profile can reach to higher than 90% for total unpolarized wave under 28.2°±4°incident angle.
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Xin Rong Chen, Chao Ming Li, Jian Hong Wu, "Design of high efficiency, broad bandwidth unpolarized transmission grating for femtosecond laser", Proc. SPIE 10016, High-Power Lasers and Applications VIII, 100161K (9 November 2016); doi: 10.1117/12.2245821; https://doi.org/10.1117/12.2245821
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