摘要
基于夫琅禾费远场衍射理论和达曼(Dammann)光栅设计原理,利用液晶空间光调制器(LCSLM)的相位调制特性设计了产生5×5点阵结构光的相位型光栅。以显示二维Dammann光栅为例,采用模拟退火算法根据预期的光能利用率和光强不均匀性对光栅一个周期内的相位分布值进行优化,设计了5×5点阵Dammann光栅分束结构。然后利用Matlab进行远场衍射仿真,光能利用率可达到79.94%,光强不均匀性可达到13.28%。将光栅结构加载到LCSLM上,得到了光强不均匀性为27.53%、零级衍射光强均匀分布的5×5点阵,且光能利用率达到71.06%。数值模拟及光学实验结果证明了LCSLM可以在结构光再现光学系统中清晰地再现点阵结构光。与传统的结构光相比,设计的结构光在衍射距离发生变化的时候,其点与点之间的间距不发生改变。
From the Fraunhofer far-field diffraction theory and Dammann grating design principle,we used the phase modulation characteristics of the liquid crystal spatial light modulator(LCSLM)to design a 5×5 lattice-structured light pair phase grating.By considering the display of a two-dimensional Dammann grating,we used the simulated annealing algorithm to optimize the phase distribution value within one period of the grating with respect to the expected light energy utilization rate and light intensity non-uniformity.Thus,the beam splitting structure of the Dammann grating,which can form 5×5 lattice,is designed.Next,Matlab was used to simulate the far-field diffraction to obtain the light energy utilization rate and unevenness of light intensity reach 79.94% and 13.28%,respectively.The grating structure was loaded on the LCSLM,and a 5×5 lattice with 27.53% light intensity unevenness and uniform distribution of zero-order diffracted light intensity was obtained.Also,the light energy utilization rate reached 71.06%.Numerical simulation and optical experimental results prove that the LCSLM can clearly reproduce the lattice-structured light in the structured light reproduction optical system.Compared with the traditional structured light,the structured light designed in this paper does not change the distance between points when the diffraction distance changes.
作者
朱妍
张锦
蒋世磊
孙国斌
胡驰
Zhu Yan;Zhang Jin;Jiang Shilei;Sun Guobin;Hu Chi(School of Optoelectronic Engineering,Xi’an Technological University,Xi’an 710021,Shaanxi,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2022年第13期145-149,共5页
Laser & Optoelectronics Progress
基金
陕西省教育厅重点实验室科研计划(18JS053)
陕西省科技厅重点实验室项目(2013SZS14-P01)。
关键词
衍射与光栅
Dammann光栅
液晶空间光调制器
结构光再现
衍射结构
diffraction and grating
Dammann grating
liquid crystal spatial light modulator
structured light reproduction
diffraction structure
