为满足星间激光通信对高隔离水平光学天线的要求,实现对光学天线隔离度的仿真分析和优化,提出了一种将红外系统冷反射的特征控制量YNI值作为衡量光学元件表面后向反射能量强度,并控制光学天线优化以提高隔离度水平的方法。在Light Tool...为满足星间激光通信对高隔离水平光学天线的要求,实现对光学天线隔离度的仿真分析和优化,提出了一种将红外系统冷反射的特征控制量YNI值作为衡量光学元件表面后向反射能量强度,并控制光学天线优化以提高隔离度水平的方法。在Light Tools软件中为某激光通信终端的卡塞格林天线创建了实体模型,通过仿真分析得出了各元件表面的后向反射率。在ZEMAX软件中以增大各元件表面的YNI值为目标优化天线结构。对比优化前后的结果,系统的后向反射率从3.068 8×10^(-4)减小到1.075 5×10^(-5),隔离度从-35.13 d B减小到-49.68 d B。优化后的卡塞格林天线具备较高的隔离度水平,可用于星间激光通信。展开更多
Metals in nature exhibit a mediocre wettability and a high optical reflectance from the visible region to the infrared. This Letter reports that, by formation of nano- and microscale structures via a simple raster sca...Metals in nature exhibit a mediocre wettability and a high optical reflectance from the visible region to the infrared. This Letter reports that, by formation of nano- and microscale structures via a simple raster sca.nning of a focused femtosecond laser pulse without any further treatment, structured aluminum and nickel surfaces exhibit combined features of superhydrophobicity with a contact angle of 155.5°, and a high optical absorption with a rcflectivity of several percent over a broad spectral range （0.2-2.5μm）. Thus, a multifunctional structured metal surface that integrates superhydrophobicity and a high broadband absorptivity has been easily realized by one-step femtosecond laser processing.展开更多
文摘为满足星间激光通信对高隔离水平光学天线的要求,实现对光学天线隔离度的仿真分析和优化,提出了一种将红外系统冷反射的特征控制量YNI值作为衡量光学元件表面后向反射能量强度,并控制光学天线优化以提高隔离度水平的方法。在Light Tools软件中为某激光通信终端的卡塞格林天线创建了实体模型,通过仿真分析得出了各元件表面的后向反射率。在ZEMAX软件中以增大各元件表面的YNI值为目标优化天线结构。对比优化前后的结果,系统的后向反射率从3.068 8×10^(-4)减小到1.075 5×10^(-5),隔离度从-35.13 d B减小到-49.68 d B。优化后的卡塞格林天线具备较高的隔离度水平,可用于星间激光通信。
基金supported by the National 973 Program of China(No.2013CB922404)the National Natural Science Foundation of China(Nos.11074027,61178022,and 11274053)+1 种基金the Funds from Science and Technology Department of Jilin Province(No.20111812),the Project 14KP007the Research Fund for the Doctoral Program of Higher Education of China(Nos.20122216120009,20122216110007,and 20112216120006)
文摘Metals in nature exhibit a mediocre wettability and a high optical reflectance from the visible region to the infrared. This Letter reports that, by formation of nano- and microscale structures via a simple raster sca.nning of a focused femtosecond laser pulse without any further treatment, structured aluminum and nickel surfaces exhibit combined features of superhydrophobicity with a contact angle of 155.5°, and a high optical absorption with a rcflectivity of several percent over a broad spectral range （0.2-2.5μm）. Thus, a multifunctional structured metal surface that integrates superhydrophobicity and a high broadband absorptivity has been easily realized by one-step femtosecond laser processing.
