基于透镜阵列的眼科准分子激光光束整形与匀光系统  

Beam Shaping and Homogenization System with Lens Array for Ophthalmic Excimer Laser Refractive Surgery

作　　者：厉以宇[1] 王伟[1] 陈娇洁[1] 戴志岳[1] 林铎儒[1] 郑聪[1] 

机构地区：[1]温州医学院眼视光学院,浙江温州325027

出　　处：《激光与光电子学进展》2011年第8期133-137,共5页Laser & Optoelectronics Progress

基　　金：浙江省重大科技专项(2010C03002;2008C13001);浙江省公益性技术应用研究计划(2010C31060);科技部国际合作重点项目(2008DFA307050)资助课题

摘　　要：为提高屈光手术中准分子激光的能量利用率和光斑均匀性,设计了一套由双排透镜阵列和会聚透镜组成的准分子激光光束整形与匀光系统。借助近轴光学计算发现,通过调节双排透镜阵列的间距可以改变聚焦光斑的尺寸,通过调节透镜阵列与会聚透镜之间的距离可以改变光学系统的整体长度而不影响聚焦光斑的形态。利用光线追迹方法对该系统进行了模拟分析,在会聚透镜像方焦平面上获得了呈均匀分布的方形聚焦光斑,并给出了聚焦光斑尺寸随双排阵列透镜间距的变化过程。分析了接收面离焦对光斑尺寸和能量分布产生的影响,指出所设计的光束整形与匀光系统可以满足准分子激光屈光手术对激光光斑质量的要求。In order to improve the laser energy efficiency and beam uniformity in excimer laser refractive surgery, a novel laser beam shaping and homogenization system based on double lens array and a converging lens is designed. The prototype is evaluated by paraxial optics over a range of system parameters. A linear relationship is observed between the size of focusing laser spot and the spacing of double lens array. The overall length of the component can be changed by adjusting the distance between the lens array and the converging lens without affecting the final form of focusing spot. Ray tracing simulation method demonstrates the uniform square focusing spot on the back focal plane of the converging lens, and the change process of the focusing spot size depending on the spacing of double lens array. The impact of defocus on spot size and energy distribution is also analyzed. This beam shaping and homogenization system can meet with the quality requirements of focusing laser spot for excimer laser refractive surgery.

关 键 词：激光光学 光束整形 匀光 准分子激光 透镜阵列 

分 类 号：O439[机械工程—光学工程]