Ms. Qijing Mei Profile

Qijing Mei

at Soochow Univ

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Proceedings Article | 6 November 2015 Paper

The transmission volume-phase holographic grating recorded on dichromated gelatin film used in Raman spectrometer

Qijing Mei, Peng Liu, Minxue Tang

Proceedings Volume 9667, 96670D (2015) https://doi.org/10.1117/12.2199835

KEYWORDS: Diffraction, Diffraction gratings, Spectroscopy, Raman spectroscopy, Modulation, Refractive index, Holography, Volume holography, Laser scattering, Optical design

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With the intrinsic advantages of high diffraction efficiency, signal to noise ratio, wavelength and angular selectivity, and low scattering and absorption, volume phase holographic grating (VPHG) has been widely used for spectroscopy, telecommunications, astronomy and ultra-fast laser sciences. The transmission VPHG combined with on-axis imaging lenses can be used in the Raman spectroscopic imaging, which enables a spectrometer to work at high resolution over a wide field of view, and compresses the configuration to achieve very little vignetting. The subject of this paper is to design a kind of transmission VPHG used in Raman Spectrometer with high diffraction efficiency theoretically. According to the Bragg condition and the coupled wave theory, the diffraction efficiency of transmission VPHG recorded on dichromated gelatin (DCG) has been optimized by using G-solver software, which is applicable to the visible waveband ranging from 0.46μm to 0.70μm. 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 analyzed at the same time.

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.

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