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随着高能激光系统的发展,对光学薄膜抵抗激光损伤能力的要求越来越高,而激光脉宽是脉冲激光对薄膜损伤行为的重要影响因素。针对Ta2O5/SiO2多层膜,基于1-on-1测试方法,分析其在飞秒、皮秒、纳秒激光作用下的损伤特性。测得800 nm飞秒激光作用下的损伤阈值为1.67 J/cm2;532 nm和1 064 nm皮秒激光作用下的损伤阈值分别为1.08 J/cm2和1.98 J/cm2;532 nm和1 064 nm纳秒激光作用下的损伤阈值分别为9.39 J/cm2和21.57 J/cm2,并使用金相显微镜观察了滤光膜的损伤形貌。实验结果表明:飞秒激光对滤光膜的损伤机理主要是多光子电离效应,而皮秒和纳秒激光对滤光膜的损伤机制主要是热效应。滤光膜在飞秒激光作用下的损伤阈值与皮秒激光作用下的损伤阈值相当,纳秒激光作用下的损伤阈值要高一个数量级,透射通带外损伤阈值约为通带内损伤阈值的2倍。 相似文献
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In order to study the influence of backscattering of indicating laser in laser guidance process and laser guidance countermeasure test, the scattering function and volume extinction coefficient of typical aerosol distribution are calculated, and the backscattering detection model of 1.06 μm horizontally transmitted laser is established, based on Mie scattering theory and scattering function optimization algorithm; the model is used to study the change of backscattering energy detected by the detector at different positions and different detection angles, and the false-alarm area of laser guidance along the indicating laser path under different detection thresholds is obtained. The results can help to deepen the understanding of the influence of atmospheric scattering on the laser guidance process, and provide theoretical reference for the scheme design of the laser guidance countermeasure test. 相似文献
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基于客观法模糊模式识别理论在红外烟幕对跟踪系统遮蔽干扰效果评估中的使用需求,结合多分辨率理论提出了烟幕遮蔽干扰判别特征提取的方法.在对多分辨率理论进行相应分析的基础上给出了基于模糊模式识别的烟幕干扰效果评估方法和测试步骤,在特征提取中采取小波多分辨率理论分析的方法构建模糊模式识别特征矢量.最后作为验证,给出了结合模糊模式识别的小波多分辨率理论在烟幕对跟踪系统遮蔽干扰效果矢量检测和数据处理的分析结果,为野外环境下红外烟幕对跟踪系统干扰的自动判断提供一个基本矢量特征. 相似文献
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