激光无线能量传输发射光学系统研制  

Development of emission optical system for laser wireless power transmission

作　　者：孟祥翔 尚涵 辛明瑞 王旭东 邱明杰 Meng Xiangxiang;Shang Han;Xin Mingrui;Wang Xudong;Qiu Mingjie(School of Physics and Electronic Information,Yantai University,Yantai 264005,China;School of Information Science and Engineering,Harbin Institute of Technology,Weihai,Weihai 264209,China;Military Science Systems Engineering Research Institute,Beijing 102300,China)

机构地区：[1]烟台大学物理与电子信息学院,山东烟台264005 [2]哈尔滨工业大学(威海)信息科学与工程学院,山东威海264209 [3]军事科学系统工程研究院,北京102300

出　　处：《红外与激光工程》2023年第9期192-198,共7页Infrared and Laser Engineering

基　　金：山东省自然科学基金项目(ZR2022QF095)。

摘　　要：为了提升激光无线能量传输系统光能传输效率,避免使用准直镜头导致在数百米距离处接收端光斑边界模糊和照度均匀性差现象的发生,开展了基于共轭成像原理的可调焦发射光学系统研制。首先理论分析了准直法和共轭成像法的设计原理,然后针对光纤输出的808 nm半导体激光光源,采用共轭成像法设计了焦距550 mm、口径260 mm的发射光学系统,通过光纤端面的移动实现调焦设计,分析了不同调焦距离下光纤端面的移动量,并与准直法设计结果调焦后对比,在200 m~1 km处的波像差明显较小。利用Lighttools软件模拟对比了调焦前后的照射光斑,验证了调焦的作用。模拟结果显示,通过对基于共轭成像原理设计的发射光学系统增加调焦机构,可在不同距离处得到清晰的光斑边界。最后对激光发射光学系统进行了加工,经测试,波像差RMS为0.092λ(λ=632.8 nm)。结果表明:激光无线能量传输系统使用基于共轭成像原理设计的可调焦发射光学系统可获得边界清晰、更加均匀的照明光斑。Objective The emission lens of the laser wireless power transmission system is mostly a collimated lens,which is designed using the optical fiber collimation principle and the non-focus mode of the optical design software.The end face of the optical fiber is placed at the focal plane of the lens,and the beam on and off the axis is emitted externally in the form of parallel beam.Because the end face of the optical fiber has a object height,there is a geometric divergence angle between the on-axis beam and the off-axis beam.For the collimated lens with the image plane at infinity,the off-axis beam and the on-axis beam present a staggered superposition state on the illuminated surface at a relatively close distance.Even if the illuminance distribution of the rectangular fiber core is uniform,the light spot on the receiving surface of the power transmission still presents a Gaussian distribution that gradually weakens from the center to the periphery,and the light spot boundary is not clear,which reduces the power transmission efficiency of the laser wireless power transmission system.In order to improve the optical power transmission efficiency of the laser wireless power transmission system and avoid the blurring of the light spot boundary and the poor illumination uniformity at the receiving surface at a distance of hundreds of meters caused by the use of a collimated lens,the development of a focusing transmission optical system based on the conjugate imaging principle was carried out.Methods Firstly,the design principles of collimation method and conjugate imaging method are analyzed theoretically.Then,aiming at the 808 nm semiconductor laser light source output by optical fiber,a transmitting optical system with a focal length of 550 mm and an aperture of 260 mm is designed using conjugate imaging method(Fig.2).Focusing design is realized through the movement of optical fiber end face.The movement of optical fiber end face under different focusing distances is analyzed(Fig.4).Compared with the design results of

关 键 词：激光无线传能 发射光学系统 共轭 调焦 

分 类 号：O439[机械工程—光学工程]