基于液晶空间光调制器的激光束近场整形  

Near-Field Beam Shaping based on Liquid Crystal Spatial Light Modulator

作　　者：马浩统[1] 周朴[1] 王小林[1] 马阎星[1] 汪晓波[1] 许晓军[1] 刘泽金[1] 

机构地区：[1]国防科学技术大学光电科学与工程学院,湖南长沙410073

出　　处：《光学学报》2010年第7期2032-2036,共5页Acta Optica Sinica

摘　　要：激光器输出的光束光强通常为高斯分布,但在很多实际应用中,为了提高激光系统的整体利用效率,需要将高斯分布的光束整形为空间均匀分布的平顶光束。从能量守恒定律和等光程原理出发,分析了非球面镜整形系统,得到了面型相位分布,基于此原理利用纯相位型液晶空间光调制器实现了对近高斯分布光束的光强整形,获得了近"平顶"的光束近场分布,并利用哈特曼波前传感器测量了整形后的光束波前相位分布。Typical intensity distribution of laser beam is Gaussian profile.To improve the energy efficiency of the laser systems,it is necessory to convert Gaussian profiles or quasi-Gaussian profiles into uniform profiles.Based on the energy conservation and constant optical path-length principle,the spatial beam shaping system with aspheric lenses is analyzed in detail and the phase distribution for the optics is derived.In addition,a quasi-flattop intensity distribution is realized from the quasi-Gaussian beam by phase only liquid crystal spatial light modulator.The phase distribution of the shaped beam is measured by a wavefront sensor.

关 键 词：激光光学 光束整形 非球面透镜 液晶空间光调制器 

分 类 号：TN249[电子电信—物理电子学]