Two-dimensional non-spatial filtering based on holographic Bragg gratings |
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Authors: | He Yan-Lan Zheng Hao-Bin Tan Ji-Chun Ding Dao-Yi Zheng Guang-Wei Wang Xiao-Dong and Wang Xiao |
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Institution: | Science College, National University of Defense Technology, Changsha 410073, China; Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China |
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Abstract: | The filter made up of two gratings performs as a two-dimensional non-spatial filtering. This paper reports that the volume Bragg gratings are fabricated by interfering two collimated coherent laser beams in photopolymer. Diffraction efficiency of a single grating is up to 78% in Bragg's condition, then a two-dimensional non-spatial filter, which consists of two volume Bragg gratings and a half-wave plate, enables the laser beam filtered in two dimensions with the diffraction efficiency of 54%. The Bragg's condition and effect of polarisation on performances of the two-dimension filter are also discussed. |
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Keywords: | spatial filter Bragg gratings two-dimensional filtering polarisation |
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