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相关概念视频

Focusing of Light in the Eye01:16

Focusing of Light in the Eye

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Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
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相关实验视频

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用于宽带成像的大范围伸展调整平面镜头.

Junhao Zhang, Yajing Wang, Jiaju Wang

    Optics express
    |February 18, 2026
    PubMed
    概括

    研究人员使用聚甲基 (PDMS) 开发了一种可调节的衍射透镜,可提供宽带无色性能. 这种灵活的镜头使先进的成像系统能够持续调整焦点,克服了衍射光学中的一个关键挑战.

    科学领域:

    • 光学和光子学 在光学和光子学.
    • 材料科学 材料科学 材料科学
    • 图像技术技术的成像技术

    背景情况:

    • 折射镜头比折射镜头提供重量优势,这对于紧的成像系统至关重要.
    • 多焦衍射镜头在显微镜和智能手机相机等应用中提高了灵活性.
    • 在多焦衍射镜片中实现非色性能是一个重要的技术障碍.

    研究的目的:

    • 介绍一款具有宽带无色色能力的新型可调和波衍射镜头.
    • 用机械拉伸来证明可见光谱中持续的焦距调整.
    • 为了验证镜头在成像应用中的性能.

    主要方法:

    • 使用聚二甲基 (PDMS) 制造衍射透镜,其配置为23微米,基板为100微米.
    • 实施电机控制的拉伸机制 (1-1.2×) 来调整镜头的焦距.
    • 镜头的焦调范围和在白光下宽带成像性能的表征.

    主要成果:

    • 可调节的波离散透镜在可见光谱中运行,具有宽带性能.
    • 焦点长度呈现出与应用的拉伸比率的第四次数成比例的缩放.
    • 通过可控拉伸实现了从40.4毫米到79.5毫米的持续焦点调整.

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    结论:

    • 开发的基于PDMS的可调和波透镜为无色多焦成像提供了可行的解决方案.
    • 它的宽带成像能力和持续的焦点调整使其适用于先进的光学系统.
    • 这项工作促进了灵活和可适应的衍射光学元件的开发.