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Related Concept Videos

Focusing of Light in the Eye01:16

Focusing of Light in the Eye

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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Updated: Jun 8, 2026

Construction of a High Resolution Microscope with Conventional and Holographic Optical Trapping Capabilities
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Published on: April 22, 2013

Molded-glass optical element for focusing servos.

Y Tanaka, M Sunohara, J Murata

    Applied Optics
    |September 24, 2010
    PubMed
    Summary

    This study integrates a double-knife-edge method into a molded-glass optical element (MGOE) for precise focusing error detection. The aspherical design eliminates focus offset, improving optical system accuracy.

    Area of Science:

    • Optical Engineering
    • Metrology

    Background:

    • Focusing errors in optical systems can degrade performance.
    • Molded-glass optical elements (MGOEs) are used in various applications.
    • Accurate focusing is critical for photodetector performance.

    Purpose of the Study:

    • To integrate a double-knife-edge method for focusing error detection into an MGOE.
    • To evaluate the impact of surface geometry on focusing accuracy.
    • To minimize groove cross noise in MGOEs.

    Main Methods:

    • Designed an MGOE with a dual-surface geometry (slant plane/sphere and asphere).
    • Simulated groove cross noise caused by geometrical aberrations.
    • Experimentally validated focusing offset and noise levels.

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    Main Results:

    • The aspherical second surface eliminated focus offset, unlike a spherical surface which caused a 3 µm offset for a 10 µm photodetector shift.
    • Simulations and experiments showed less than 0.3 µm of groove cross noise in the MGOE.
    • The integrated double-knife-edge method proved effective for focusing error detection.

    Conclusions:

    • Aspherical surfaces in MGOEs significantly improve focusing accuracy by eliminating offset.
    • The developed MGOE with integrated focusing error detection meets stringent noise requirements.
    • This technology enhances the precision of optical systems utilizing MGOEs.