涡旋波干涉振幅全息图的计算机制作

根据数学模型,借助计算机语言编程制作了涡旋波干涉的振幅全息图.结果表明:涡旋波分别与平面波和球面波干涉,形成叉形光栅和螺旋环形光栅全息图样,且图样分布随涡旋波拓扑荷值的变化而变化.当拓扑荷值由正整数变为负整数时,叉形光栅的开口方向和螺旋环的旋转方向发生反转;当拓扑荷值变为分数时,全息图样发生不同程度的位错.该全息图可作为振幅掩模或直接加载于液晶空间调制器,用于生成涡旋光束.

Computer preparation of amplitude holograms generated by interference of vortex waves

Based on the mathematical mode, the amplitude holograms generated by the interference of vortex waves were prepared by computer program. The fork-shaped grating and spiral ring shaped grating could be formed by the interference of vortex waves with plane waves and spherical waves respectively, and the distributions of the hologram change with the topological charge of the vortex waves. When the topological charge changed from positive integer to negative integer, the opening direction of the fork-shaped grating and the rotating direction of the spiral ring shaped grating would change to the contrary. When the topological charge is fraction, the hologram forms various degree of dislocation. The holograms can be used as an amplitude mask or loaded by the liquid crystal spatial light modulator to produce vortex beams.