摘要
将拓扑荷为4的螺旋相位光束与平面光干涉的计算全息图输入到空间光调制器中,得到含有多个衍射级次的高阶涡旋光束。为提高衍射效率,利用激光直写技术制作拓扑荷为4的高阶螺旋相位板,经测定,相位板深度理论数值为1.073μm,测量数值为1.082μm,相位板制作误差在0.83%以内。平行光束通过此相位板时,在夫琅和费衍射场获得一个高质量的高阶光学涡旋,光强分布与理论数值基本吻合,衍射效率达到86%。
A computer-generated hologram about spiral phase light beam with four topological charges is realized,which is then inputted into spatial light modulators（SLMs）.When a plane wave transits through the SLMs,a series of high-order optical vortices occur.In order to improve the diffraction efficiency,a spiral phase plate（SPP） with four topological charges is created by direct laser writing lithography.The theoretical depth of SPP is 1.073 μm and the measured depth is 1.082 μm,showing a manufacture error of no more than 0.83%.The efficiency and beam profile of Fraunhofer diffraction of the SPP are measured with a power meter and a CCD camera.The diffraction efficiency reaches 86% and the energy distribution is in a good agreement with theory.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2011年第12期3283-3286,共4页
High Power Laser and Particle Beams
基金
浙江省自然科学基金项目(Y1100524)
浙江师范大学博士启动资金项目(zc304009168)
关键词
衍射光学元件
螺旋相位板
光学涡旋
计算全息
激光直写
diffraction optical element
spiral phase plate
optical vortex
computer-generated hologram
direct laser writing
