Simple holographic projection in color

TLDR

The paper presents a highly simplified image projection method using optical fibers and a single spatial light modulator. The method employs iterated Fourier holograms addressed to the modulator, with electronic focusing, side‑by‑side color division, and speckle suppression via screen micro‑movements and time‑averaged holograms. Experiments demonstrate good image quality and strong resilience to obstructions in the light path.

Abstract

Extremely simplified image projection technique based on optical fibers and a single Spatial Light Modulator is presented. Images are formed by addressing the modulator with especially iterated Fourier holograms, precisely aligned on the projection screen using phase factors of lenses and gratings. Focusing is done electronically with no moving parts. Color operation is done by spatial side-by-side division of the area of the modulator. Experimental results are given, showing good image quality and excellent resistance to obstructions in the light path. Speckles are suppressed by micro-movements of the screen and by time-averaging of a number of holograms into the final image.