多平面真三维全息显示

The True 3D Holographic Display on Multi-plane

提出了一种多平面迭代算法,通过计算多个平面之间光波的前向和后向传播得到全息面的相位分布的恢复,并且用各个平面上的目标图像的振幅来限定传播过程中的光强。该方法将三维的光场分布离散化为相干光在多个二维平行平面上的同时调制,大幅减少了全息计算量。利用纯相位空间光调制器加载计算全息图,在三个屏幕上依次得到三个不同景深的图像,对于人眼调焦过程进行了模拟,实现了多平面真三维显示。系统简单,对于运算处理与显示器件的要求不高,易于实现。

A new multi-plane iterationalgorithm is proposed to compute the phase-only hologram.To retrieve the pure phase distribution on the hologram plane,forward and backward propagation is calculated from plane to plane.The amplitude distribution on each output plane is modified according to the amplitude constraint,which is the image pattern that will be modulated on each plane,while allowing their phase distributions to drift into an optimum value.3D light distribution is realized by simultaneously modulating coherent light in several parallel 2D planes.By using aphase-only spatial light modulator on which the computer generated holograms load,images at different depth planes are sharply projected onto the closely spaced screens,which mimics the accommodation of natural vision.The system is simple and extra requirements are not needed for computation power or display devices.