Beam steering limitation of a Risley prism system due to total internal reflection

Zhou Yuan; Fan Shixun; Chen Yin; Zhou Xiaoxia; Liu Guangcan

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Beam steering limitation of a Risley prism system due to total internal reflection

机译：基于内部反射率棱镜棱镜系统的光束转向限制

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Limitations of beam steering in Risley prisms, induced by total internal reflection, are investigated for the four typical configurations. The incident angles at the exit surfaces of double prisms are calculated by nonparaxial ray tracing and compared with the critical angle. On this basis, the limitations of the opening angle, relative orientation of the prisms, and ray deviation power of the system are derived. It is shown that the ray deviation power reaches its extreme value when the opening angles increase to a certain limit value for a given prism material. As the opening angles exceed the limit value, the prisms' relative orientation is limited. With the increase in refractive index, the limit value of opening angles decreases, while the extreme value of deviation power increases. In comparison to a 21-12, 12-12 configuration, a 21-21, 12-21 configuration has a larger limit value of opening angles and also a larger extreme value (90 degrees) of deviation power, so that it leaves a wider margin for the design of wide-angle beam steering system. The research can afford guidance for prism material and geometry choices in the design of a wide-angle Risley-prism-based beam steering system. (C) 2017 Optical Society of America

机译：通过全内反射诱导的梁棱镜中光束转向的局限进行了四种典型配置。双棱镜的出口表面处的入射角通过不扩展的射线跟踪来计算并与临界角进行比较。在此基础上，推导出打开角度，棱镜的相对取向和系统的射线偏差功率的局限性。结果表明，当开口角度增加到给定棱镜材料的一定限制值时，光线偏差功率达到其极值。随着开口角度超过极限值，棱镜的相对取向是有限的。随着折射率的增加，开度角度的极限值降低，而偏差功率的极值增加。与21-12,12-12配置相比，21-21,12-21配置具有更大的开口角度的限值，并且还具有更大的极值（90度）的偏差功率，因此它留下了更宽的广角光束转向系统设计的边缘。该研究可以为棱镜材料和几何选择提供指导，包括基于广角型棱镜的光束转向系统。（c）2017年光学学会

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《Applied optics》 |2017年第22期|共8页
作者
Zhou Yuan; Fan Shixun; Chen Yin; Zhou Xiaoxia; Liu Guangcan;
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作者单位

Changsha Univ Dept Elect &

Commun Engn Changsha 410022 Hunan Peoples R China;

Natl Univ Def Technol Coll Mech Engn &

Automat Changsha 410073 Hunan Peoples R China;

Changsha Univ Dept Elect &

Commun Engn Changsha 410022 Hunan Peoples R China;

Changsha Univ Dept Elect &

Commun Engn Changsha 410022 Hunan Peoples R China;

Changsha Univ Dept Elect &

Commun Engn Changsha 410022 Hunan Peoples R China;

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Beam steering limitation of a Risley prism system due to total internal reflection

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