Color Reproduction by Multi-Wavelength Bragg Diffraction of White Light

Abstract

Accurate color reproduction is highly important in multiple industrial, biomedical and scientific applications. Versatile and tunable light sources with high color-rendering quality are very much in demand. In this study, we demonstrate the feasibility of multi-wavelength Bragg diffraction of light for this task. Tuning the frequencies and amplitudes of bulk acoustic waves in the birefringent crystal demonstrates high precision in setting the number, wavelengths and intensities of the monochromatic components necessary to reproduce a specific color assigned according to its coordinates in the CIE XYZ 1931 space. We assembled a setup based on multi-bandpass acousto-optic (AO) filtration of white light and verified the reproduced color balance in multiple experiments. The proposed approach delivers almost full coverage of the CIE XYZ 1931 space and facilitates building compact color reproduction systems (CRSs) for various purposes.

Angular-Spectral Characteristics of Acousto-Optic Tunable Filters Based on Mercurous Halide Crystals

“…This effect causes incident light to diffract in one or multiple directions and is extensively employed in acousto-optic (AO) devices for modulating light across multiple parameters [ 1 ]. One notable such device is the acousto-optic tunable filter (AOTF), a compact, electronically addressable, solid-state tunable filter that has been extensively studied for use in space exploration [ 2 ], spectral microscopy [ 3 ], color reproduction [ 4 ], laser control [ 5 ], and spectral imaging [ 6 ]. AOTFs operate with an AO crystal, wherein incident light undergoes diffraction due to acoustic waves generated by ultrasonic transducers.…”