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相关概念视频

Interference and Diffraction02:18

Interference and Diffraction

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Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
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Phase Contrast and Differential Interference Contrast Microscopy01:26

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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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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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脉冲数字全息图的边缘可见性,具有很大的光路差异.

Samuel T Thurman, Anthony C Klee

    Journal of the Optical Society of America. A, Optics, image science, and vision
    |September 22, 2025
    PubMed
    概括

    通过使用脉冲激光源,即使具有长光路径差异 (OPD),也可以实现稳定的干扰边缘. 脉冲干扰测量保持高边缘可见性,对于数字全息等应用至关重要.

    科学领域:

    • 光学和光子学 在光学和光子学.
    • 干涉测量和全息学

    背景情况:

    • 干扰测量的稳定干扰边缘要求光路径差 (OPD) 小于源相干长度.
    • 大型OPD会导致边缘相位漂移,降低可见性,并随着时间的推移洗掉边缘.

    研究的目的:

    • 在干涉测量中使用来自连续波 (CW) 激光源的光脉冲来分析边缘可见性.
    • 为了证明高边缘可见性与OPD超过连贯长度使用脉冲源.

    主要方法:

    • 对脉冲干扰的边缘可见度大小平方的表达式的导出.
    • 从CW激光源中雕刻的光脉冲的分析.

    主要成果:

    • 高边缘可见性可以实现,即使OPD比源连贯长度长得多.
    • 指规则:源连贯时间应至少是脉冲持续时间的10倍,以 >95%的可见度与洛伦兹线形状.

    结论:

    • 脉冲干扰测量提供了一个可行的方法,以保持高边缘可见性,在大型OPD的系统.
    • 这一发现对于在远程遥感中设计数字全息系统至关重要,因为在远程遥感中,路径长度匹配具有挑战性.

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