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集成光学声光可调谐光谱仪的特性分析 总被引:2,自引:0,他引:2
提出了一种以集成光学声光可调谐滤波器作为分光元件的新型光谱仪 ,并详细介绍了这种光谱仪的具体特性。通过对这种光谱仪的特征方程、点扩展函数以及色散本领的详细分析 ,指出该光谱仪的分辨本领与器件的声光作用长度成正比 ,也与它的级联级数的平方根成正比。因此增加器件的声光作用长度比增加它的级联级数能更有效地提高光谱分辨率。另外还指出 ,准共线声光耦合是抑制侧瓣、提高分辨本领的有效途径。测试表明 ,当声光相互作用长度L =2 5mm ,声波导和光波导的夹角θ=0 .4 2°时 ,在中心频率 174MHz附近可获得带宽 1.4 4nm ,一级侧瓣 - 13.2dB ,模式转换效率大于 99%的结果。 相似文献
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Isolation of a new structured acousto-optic switch based on an integrated optical polarization-independent quasi- collinear acousto-optic tunable filter is studied in detail. The factors that influence the isolation of the optical switch are analysed, the expressions of the isolation are educed, and the isolation of the device is measured in experiment. It is found that the isolation mainly depends on the TE/TM mode intensity ratio, the mode-splitter extinction rate, and the conversion efficiency. 相似文献
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采用Monte Carlo法研究散射相函数对光源附近微区内的漫反射光的影响,分析一个半经验的漫反射解析模型与相函数相关的光学参量之间的关系.研究表明,来自光源附近微区的散射光对散射相函数的变化非常敏感,敏感程度随收集孔径φ的增大而逐渐减弱.当φ1.8mm时,散射相函数对漫反射率的影响不明显,反射率的相对变化小于1%;当φ1.8mm时,散射相函数对漫反射率的影响高达15.2%.用各向异性因子g和二阶光学参量γ表征单粒子散射特性时,散射特性的差异反应在三阶参量δ上.漫反射率随δ的增加而减小,并且δ对漫反射率的影响达到9%. 相似文献
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A modified diffusion approximation model called the hybrid diffusion approximation that can be used for highly absorbing media is investigated. The analytic solution of the hybrid diffusion approximation for reflectance in two-source approximation and steady-state case with extrapolated boundary is obtained. The effects of source approximation on the analytic solution are investigated, and it is validated that two-source approximation in highly absorbing media to describe the optical properties of biological tissue is necessary. Monte Carlo simulation of recovering optical parameters from refiectant data is done with the use of this model. The errors of recovering μ's and μ's are smaller than 15% for the reduced albedo between 0.77 and 0.5 with the source-detector separation of 0.4-3 mm. 相似文献
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