基于空间光调制器的多层图像的构建与可视化

Reconstruction and Visualization of Multi-plane Images Based on Spatial Light Modulator

为解决实时直观地观察多层再现图像的问题,提出利用发光材料实现其可视化.针对由沿光轴方向的二维图层组成的空间图像,利用高效、快速的三维Gerchberg-Saxton算法,得到位相型计算全息图,并通过计算机进行了数字模拟再现.阐述了三维Gerchberg-Saxton算法的流程,并搭建了基于液晶空间光调制器的位相全息图光学再现与可视化光路.利用液晶空间光调制器的灰度-位相曲线把计算全息图转换为灰度图,加载在液晶空间光调制器上,再现出高质量的三维光场,同时利用量子点材料的荧光特性实现了图像的可视化.实验结果表明,光学再现与计算机模拟结果较吻合.该技术在医学、军事、三维显示、微加工以及显微技术等领域有重要应用价值.

In order to achieve a real-time and visual observation of multi-plane images,a method using light-emitting materials is proposed.A 3D object can be divided into a series of 2D slices along the optical axis.With an efficient and fast 3D Gerchberg-Saxton algorithm,a computer-generated phase hologram is obtained and a numerical reconstruction is carried out on the computer.The process of 3D Gerchberg-Saxton algorithm is expounded,and the experiment for reconstruction and visualization of multi-plane images based on LC-SLM is conducted.With the grey level-phase curve of the LC-SLM,the computer-generated phase hologram is converted to gray-scale hologram,which is loaded to the LC-SLM to reconstruct the 3D light fields.The fluorescence characteristic of quantum dot materials is used to achieve the visualization of the light fields.Experimental results show that the optical reconstruction is in good agreement with numerical simulation.This technique is applicable in medicine,military,3D display,micromachining and micro-technology.