Anisotropic Bragg diffraction of finite-sized volume holographic grating in photorefractive crystals |
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| Authors: | Aimin Yan Lingyu Wan De&#x;an Liu Liren Liu |
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| Institution: | aInformation Optics Laboratory, Shanghai Institute of Optics and Fine Mechanics, The Chinese Academy of Sciences, P.O. Box 800-211, Shanghai 201800, China;bCollege of Physics Science and Technology, Guangxi University, Nanning 530004, China |
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| Abstract: | Anisotropic diffraction of uniform plane wave by finite-sized volume holographic grating in photorefractive crystals is considered. It is found that the anisotropic diffraction can take place when some special conditions are satisfied. The diffracted image is obtained in experiment for the anisotropic Bragg diffraction in Fe:LiNbO3 crystals. A coupled wave analysis is presented to study the properties of anisotropic diffraction. An analytical integral solution for the amplitudes of the diffracted beams is submitted. A trade off between high diffraction efficiency and the deterioration of reconstruction fidelity is analyzed. Numerical evaluations also show that the finite-sized anisotropic volume grating exhibits strong angular and wavelength selectivity. All the results are useful for the optimizing design of VHOE based on finite-sized volume grating structures. |
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| Keywords: | Diffraction optics Finite-sized volume holographic grating Coupled-wave theory Anisotropic diffraction |
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