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相关概念视频

Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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X-ray Crystallography02:18

X-ray Crystallography

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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
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相关实验视频

Updated: Jun 29, 2025

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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两维二次相格子用于零级和高级衍射抑制.

Yifan Chen, Kun Zhang, Xinjie Lv

    Applied optics
    |April 3, 2024
    PubMed
    概括

    这项研究引入了一种新的二维二相格子,可以实现纯正弦形传输. 这种创新的格设计消除了不必要的衍射顺序,仅专注于第一顺序,具有潜在的光学科学应用.

    科学领域:

    • 光学和光子学 在光学和光子学.
    • 衍射物理 衍射物理

    背景情况:

    • 传统的变速网格产生多个衍射顺序.
    • 控制衍射模式对于光学应用至关重要.

    研究的目的:

    • 提出一种新的二维二元相格子.
    • 通过消除零和高阶衍射,实现纯正弦传输调制.
    • 调查拟议格子的物理机制和潜在应用.

    主要方法:

    • 开发一个理论模型,用于正弦传输调制.
    • 理论计算和实验验证格子的性能.
    • 通过格设计调整对衍射能量的操纵进行分析.

    主要成果:

    • 拟议的相格理论上消除了沿特定轴的零和高阶衍射.
    • 实现了正弦传输调制,隔离了第一阶衍射.
    • 对格设计的操纵会分散或集中衍射能.
    • 随机的几何参数变化导致在单个轴上几乎只有第一阶衍射.

    结论:

    • 介绍了一种新型的二维二相格,能够实现纯正弦传输.

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    The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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    相关实验视频

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  • 理论模型和实验结果验证了格子控制衍射顺序的能力.
  • 这项工作为光学科学和工程的进步提供了巨大的潜力.