Faculty of Physics, Warsaw University of Technology, Koszykowa 75, 00 662 Warsaw, Poland.
Opt Lett. 2011 Aug 15;36(16):3018-20. doi: 10.1364/OL.36.003018.
An improved efficient projection of color images is presented. It uses a phase spatial light modulator with three iteratively optimized Fourier holograms displayed simultaneously--each for one primary color. This spatial division instead of time division provides stable images. A pixelated structure of the modulator and fluctuations of liquid crystal molecules cause a zeroth-order peak, eliminated by additional wavelength-dependent phase factors shifting it before the image plane, where it is blocked with a matched filter. Speckles are suppressed by time integration of variable speckle patterns generated by additional randomizations of an initial phase and minor changes of the signal.
提出了一种改进的彩色图像高效投影方法。该方法使用一个具有三个迭代优化傅里叶全息图的相位空间光调制器，同时显示每个基色的全息图。这种空间分束而不是时分复用提供了稳定的图像。调制器的像素化结构和液晶分子的波动会产生零阶峰值，通过在图像平面之前添加依赖于波长的相位因子来消除该峰值，该相位因子将其移动到图像平面之前，并在图像平面之前使用匹配滤波器将其阻挡。通过对初始相位进行额外的随机化和信号的微小变化来生成可变散斑图案，并对其进行时间积分，可以抑制散斑。
