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.
Designing systems with an acousto-optical filter requires considering its small numerical aperture and crystal size. These features lead to the low efficiency of using the luminous flux, which may be crucial in practical applications of such systems for spectral analysis. The article discusses ways to increase the energy efficiency in different types lighting systems based on acousto-optic filtration.
One of the problems of systems based on the acoustic-optical cells is the low efficiency of using light flux of broadband sources. We consider different ways to increase the efficiency in such type of schemes
Multiple-window acousto-optic filtering of wide-band (white) light allows to control chromaticity of radiation in the visible range, which allows to use a system consisting of a source of radiation and an acousto-optic filter for colour reproduction problems, for instance, in colorimetry, psychophysiology, spectral analysis, biomedicine and other applied and research areas requiring radiation chromaticity control. The article describes the problem of reproduction of a necessary colour when using two or three spectral components (narrow bands), evaluates the factors affecting accuracy of colour reproduction and demonstrates the capability to reach errors below the chromatic threshold. Also it demonstrates the capabilities of reproduction of colours close to chromaticity locus in the multi-frequency mode of an acousto-optic filter.
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