Mr. Hui Liu Profile

Hui Liu

at Soochow Univ

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Proceedings Article | 19 December 2013 Paper

Volume phase holographic grating used for beams combination of RGB primary colors

Hui Liu, Xizhao Zhang, Minxue Tang

Proceedings Volume 9046, 90460M (2013) https://doi.org/10.1117/12.2034525

KEYWORDS: Diffraction, Modulation, Diffraction gratings, RGB color model, Holography, Refractive index, Volume holography, Phase shift keying, Glasses, Neodymium

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Volume phase holographic grating (VPHG) has the characteristics of high diffraction efficiency, high signal to noise ratio, high wavelength and angular selectivity, low scattering , low absorption and low cost. It has been widely used in high resolution spectrometer, wavelength division multiplexing and pulse compression technique.

In this paper, a novel kind of RGB primary colors beams combiner which is consisted of a transmission VPHG and a reflection VPHG as core components is proposed. The design idea of the element is described in detail. Based on the principle of VPHG, the rigorous coupled wave analysis (RCWA) and Kogelnik’s coupled wave theory, diffraction properties of the transmission and reflection VPHG are studied theoretically. As an example, three primary colors at wavelengths of 632.8nm, 532nm and 476.5nm are taken into account. Dichromated gelatin (DCG) is used as the holographic recording material. The grating parameters are determined by the Bragg conditions. The TE and TM wave diffraction efficiency, the wavelength selectivity and the angular selectivity of the transmission and reflection VPHG are calculated and optimized by setting the amplitude of the index modulation (Δn) and the thickness of the gelatin layer (d) by applying Kogelnik’s coupled wave theory and G-solver software, respectively. The theoretical calculating results give guidance for further manufacture of the element.

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