Improving the spatial resolution of volume Bragg grating two-dimensional monochromatic images

Duan Jiazhu; Zhao Xiangjie; Luo Yongquan; Zhang Dayong

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Improving the spatial resolution of volume Bragg grating two-dimensional monochromatic images

机译：提高卷布拉格光栅二维单色图像的空间分辨率

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Higher spatial resolution indicates sharper recognition ability in applications. To improve the spatial resolution of volume Bragg grating spectral imagers, quantitative wave vector theory is used to elucidate the formation mechanism of diffraction blur, and the corresponding optimal design approaches are put forward. The simulation results show that the main factors for the spectral image blur are the chromatic blur and diffraction aberration, while the central wavelength deviation further deteriorates these. To deal with these factors, one must optimize the grating period, thickness, slant angle, and refractive index, as well as compress the divergence angle of the incident beam. After optimization under the guidance of the newly defined integrated merit functions, the experimental results show that the optimized smeared point-spread function is reduced by about an order of magnitude. The horizontal spatial resolution of the recorded two-dimensional monochromatic images is improved to 14.3 lines/mm under diffuse reflection illumination. (C) 2018 Optical Society of America.

机译：更高的空间分辨率表示应用程序中的识别能力更高。为了提高卷布拉格光栅光谱成像仪的空间分辨率，使用定量波矢量理论来阐明衍射模糊的形成机制，并提出了相应的最佳设计方法。仿真结果表明，光谱图像模糊的主要因素是彩色模糊和衍射像差，而中心波长偏差进一步劣化。为了处理这些因素，必须优化光栅周期，厚度，倾斜角度和折射率，以及压缩入射光束的发散角度。在新定义的综合优势函数的指导下优化后，实验结果表明，优化的涂抹点展函数减少了大约一级。在漫反射照明下，记录的二维单色图像的水平空间分辨率得到改善为14.3线/ mm。（c）2018年光学学会。

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《Applied optics》 |2018年第12期|共7页
作者
Duan Jiazhu; Zhao Xiangjie; Luo Yongquan; Zhang Dayong;
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China Acad Engn Phys Inst Fluid Phys Mianyang Peoples R China;

China Acad Engn Phys Inst Fluid Phys Mianyang Peoples R China;

China Acad Engn Phys Inst Fluid Phys Mianyang Peoples R China;

China Acad Engn Phys Inst Fluid Phys Mianyang Peoples R China;

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Improving the spatial resolution of volume Bragg grating two-dimensional monochromatic images

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