利用彩虹全息是实现白光全息的常用方法,由于记录过程中引入狭缝使得再现像的视场非常狭小,且只有水平视差。在计算全息中模拟无狭缝记录,通过博奇编码获得菲涅耳全息图,以视频信号输入液晶板(LCD)显示,在白色发光二极管(LED)照明下获得同时具有水平和垂直视差的彩色全息再现像,大小为15 mm×15 mm。调整物面采样间距和滤波小孔孔径以减小色模糊、提高再现光的空间相干性,获得的白光再现像与彩虹全息图的再现像相比,前者虽然牺牲了一定的像质,但垂直视场角远大于后者,且整个系统简单紧凑、操作方便,再现像视场范围大,利于观察和接收,另外宽光谱光源和空间光调制器的使用为实现实时三维彩色全息打下了基础。 The use of rainbow holography is a commonly used method to realize white holography. Due to the introduction of slits in the recording process, the field of view of the reproduced image is very narrow, and only horizontal parallax. Slit-free recording was simulated in the computed hologram, Fresnel holograms were obtained by the Bochi encoding, video signals were input to a liquid crystal panel (LCD) display, and color with both horizontal and vertical parallax was obtained under white light-emitting diode (LED) illumination Holographic reproduction image, size 15 mm × 15 mm. Adjust the sampling interval of the object surface and the aperture of the filter aperture to reduce the color blur and improve the spatial coherence of the reproduced light. Compared with the reproduced image of the rainbow hologram, the former sacrifices a certain image quality, but the vertical The field of view is far greater than the latter, and the whole system is simple and compact, easy to operate, and the reproduction is like a wide field of view, which facilitates the observation and reception. Besides, the use of a wide-spectrum light source and a spatial light modulator lays the foundation for real-time three-dimensional color holography.