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多薄膜层材料近旁轴激光波束散射及影响因素分析

期刊名称：激光杂志
时间：0
页码：44-46
语言：中文
分类：O436.2[机械工程—光学工程;理学—光学;理学—物理] O431.1[机械工程—光学工程;理学—光学;理学—物理]
作者机构：[1]咸阳师范学院物理系,陕西咸阳712000, [2]西安电子科技大学理学院,陕西西安710071
相关基金：国家自然科学基金（60801047,60771038,60741003）和陕西省教育厅自然科学基金（08Jk480）资助
相关项目：目标激光脉冲散射四阶统计特征理论建模及其应用研究

关键词：激光散射, 基尔霍夫近似, 单双站散射系数, 近旁轴高斯波束散射, laser scattering, Kirchhoff approximation , scattering coefficient , the scattering of paraxial Gaussian beam

中文摘要：

研究了多种材料、涂层及多层介质薄膜近旁轴激光波束入射下的散射特征。数值计算不同材料，不同极化方式和入射角的激光波束单、双站散射系数，并分析不同材料物性参数、激光波束束腰半径和入射角对材料散射系数的影响。计算结果表明，金属较介质材料单、双站散射系数大，材料的介电常数、高度起伏和相关长度影响散射系数显著；对介质薄膜材料，多层介质薄膜较单层后向散射系数小9．21db；改变入射角度时，离轴激光波束对介质单多层薄膜材料散射系数影响都较小；且波束束腰半径和入射波长相比拟时，激光波束散射较强，波束束腰半径远大于入射波长时，波束逐渐趋向于平面波。

英文摘要：

The characteristic of laser beam scattered from material such as metal, coats and muhiplayer dielectric films is analyzed and studied in this paper. It is calculated and analyzed the influence factors on the backscattcred and bi - static scattered coefficients under condition in the different materials on the target and the laser boam characteristics such as the polarizations, beam waist radius and incident angles in detail. The numerical results are shown that the backscattered and bi - static scattered coefficients of metal material are bigger than theirs of the dielectric material. The dielectric constant, mean of fluctuating heights and coherent length of random rough surfaces have an important effect on the value of the scattered coefficients. For the dielectric films, the backscattered coefficients of the muhiplayer dielectric films are smaller 9.21db than those of the monolayer film. As changed the incident angle, paraxiall laser beam have little influence on scattered coefficients for multiplayer films. If the ratio between the laser beam size and the incident wavelength is smaller, the beam scattering characteristic is more remarkable on the contrary the ratio approaches to infinite, the coherent scattering coefficient is the same as for an incident plane wave.

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