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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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Related Experiment Video

Updated: Jun 15, 2026

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
10:39

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Published on: October 11, 2016

Mechanically ruled aberration-corrected concave gratings.

T Harada, T Kita

    Applied Optics
    |March 18, 2010
    PubMed
    Summary

    Mechanically ruled aberration-corrected concave gratings offer greater design flexibility than holographic methods. These gratings enable the creation of efficient monochromators and spectrographs with enhanced focusing for various spectral ranges.

    Area of Science:

    • Optics and Spectroscopy
    • Mechanical Engineering
    • Materials Science

    Background:

    • Aberration correction is crucial for high-performance optical instruments.
    • Traditional holographic gratings have limitations in groove spacing control.
    • Mechanically ruled gratings offer potential for improved optical designs.

    Purpose of the Study:

    • To investigate the fabrication and application of aberration-corrected concave gratings using mechanical ruling.
    • To design and build efficient monochromators with improved optical properties.
    • To explore the use of these gratings in VUV (Vacuum Ultraviolet) spectroscopy.

    Main Methods:

    • Utilizing a numerically controlled ruling engine for precise groove fabrication.
    • Employing mechanical ruling to achieve variable groove spacing for aberration correction.

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    Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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    Fabrication of a Low-Cost, Fiber-Coupled, and Air-Spaced Fabry-Pérot Etalon
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  • Designing and constructing visible-UV and Seya-Namioka monochromators.

    • Main Results:

    • Demonstrated superior design freedom in groove spacing variation compared to holographic methods.
    • Successfully fabricated aberration-corrected concave gratings.
    • Developed a highly efficient visible-UV monochromator.
    • Created a coma-type aberration-reduced Seya-Namioka monochromator.

    Conclusions:

    • Mechanically ruled aberration-corrected concave gratings provide enhanced design flexibility.
    • These gratings lead to monochromators and spectrographs with improved image focusing.
    • The technology shows promise for VUV applications and advanced optical systems.