| 石窟的地学基础及其分类 |
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| 引用本文： | 张和纬.石窟的地学基础及其分类[J].甘肃地质学报,1997(Z1):138-141. |
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| 作者姓名： | 张和纬 |
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| 作者单位： | 甘肃省地质学会办公室 |
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| 摘 要： | 石窟是一种佛教建筑，以往均从宗教、文化和艺术等方面加以研究，但开凿石窟离不开一定的地质地貌，尤其是岩石条件，因此，石窟与地学，特别是岩石有着密切的关系。着重岩石与石窟的关系探讨石窟的地学基础及其分类，从地学的角度探讨有关石窟的保护问题。
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| 关 键 词： | 石窟 地学 分类 保护 |
Accuarate Perturbation Analysis of Guided Modes of Planar Waveguides with Gain and Losses |
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| She Shouxian.Accuarate Perturbation Analysis of Guided Modes of Planar Waveguides with Gain and Losses[J].Acta Geologica Gansu,1997(Z1):138-141. |
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| Authors: | She Shouxian |
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| Institution: | She Shouxian (Department of Physics, Northern Jiaotong University, Beijing 100044) |
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| Abstract: | Perturbation theory and analytic formulas are presented for modal analysis of step index and graded index multilayer planar waveguides. As examples, the dependence of guided modal gain/loss on structure parameters and polarization are discussed. The method is simpler and time saving than complex shooting method for solving complex eigenvalues, and can give accurate results for practical planar structures in semiconductor lasers and laser amplifiers. It can be appled to the analysis of influence of material gain/loss coefficients on TE and TM modes and their modal gain. |
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| Keywords: | optical waveguide complex propagation constant gain and loss perturbation method |
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