Numerical Simulation for Two-Wave Mixing Using Finite Element Method
碩士 === 中原大學 === 應用物理研究所 === 94 === Photorefraction is a property of a material when a crystal index distribution follows the light distribution that shines on the crystal. As such, photorefractive material can be used for information storage as well as control or processing elements in optical info...
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| Format: | Others |
| Language: | zh-TW |
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2006
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| Online Access: | http://ndltd.ncl.edu.tw/handle/32364645345284252054 |
| Summary: | 碩士 === 中原大學 === 應用物理研究所 === 94 === Photorefraction is a property of a material when a crystal index distribution follows the light distribution that shines on the crystal. As such, photorefractive material can be used for information storage as well as control or processing elements in optical information processing systems. Among many photorefraction-induced mechanisms, two-wave mixing is most useful to monitor the interaction of light distribution and index distribution within photorefractive crystals. In this two-wave mixing mechanism, two-beams of light exchange their energy after passing through a photorefractive crystal. Up to now the analytical method can only provide an approximate solution to describe the two-wave mixing. We thus developed a numerical procedure using the finite element method to compute the light distribution under various index distributions in order to understand the interaction for the two distributions. In this thesis we found that the smaller the light beam size, the more deviation there is from the analytical results for the light distribution after passing through crystal. We also verified that the slowly-varying-amplitude approximation of the analytical solution is valid.
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