Mr. Xizhao Zhang Profile

Xizhao Zhang

at Soochow Univ

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Proceedings Article | 11 November 2014 Paper

Combined volume phase holographic gratings used as a beam splitter in near-infrared waveband

Xizhao Zhang, Qijing Mei, Minxue Tang

Proceedings Volume 9271, 927124 (2014) https://doi.org/10.1117/12.2071289

KEYWORDS: Diffraction, Diffraction gratings, Beam splitters, Absorption, Holography, Refractive index, Volume holography, Modulation, Carbon dioxide, Gases

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With the intrinsic advantages of high diffraction efficiency, signal to noise ratio, wavelength and angle selectivity, and low scattering and absorption, volume phase holographic gratings (VPHGs) have been widely used for spectroscopy, telecommunications, astronomy and ultra-fast sciences. In this paper, a novel kind of beam splitter which is consisted of a transmission VPHG and a reflection VPHG as core components and used in near-infrared waveband is proposed. The design idea of the device is described in detail. Based on the Bragg condition and the rigorous coupled wave analysis (RCWA), diffraction properties in near-infrared waveband of the transmission and reflection VPHGs recorded in dichromated gelatin (DCG) are studied theoretically. As an example, two wavebands that need to be separated in near infrared spectrum region are taken into account. One that from 1.574μm to 1.617μm centered at 1.596μm will be diffracted by the reflection grating, and the other that from 1.636μm to 1.682μm centered at 1.659μm will be diffracted by the transmission grating. The diffraction efficiencies of the gratings are calculated and optimized by applying Kogelnik's coupled wave theory and G-solver software, respectively. The recording setup is also designed for further experiments. The effects of the recording and reconstruction setup parameters, the amplitude of the index modulation (Δn) and the thickness of the gelatin layer (d), and the polarization state of reconstruction beams on the diffraction efficiency properties of the gratings are calculated and analyzed. This kind of beam splitter is prospected to be used in spectrometers for greenhouse gases monitoring.

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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