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Phase Contrast and Differential Interference Contrast Microscopy01:26

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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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Three-mirror aplanatic telescope with low diffraction sidelobes.

H P Gush

    Applied Optics
    |September 11, 2010
    PubMed
    Summary

    A novel three-mirror telescope design places secondary and tertiary mirrors behind the primary, avoiding light path obstruction. This innovative telescope configuration minimizes diffraction sidelobes for improved astronomical observations.

    Area of Science:

    • Optical engineering
    • Telescope design

    Background:

    • Traditional telescope designs can suffer from diffraction sidelobes due to mounting structures obstructing the light path.
    • Minimizing stray light and diffraction is crucial for sensitive astronomical observations, especially in specific wavelength regions.

    Purpose of the Study:

    • To present a novel three-mirror, rotationally symmetric telescope design.
    • To eliminate diffraction sidelobes by strategically positioning secondary and tertiary mirrors.
    • To achieve high image quality within a specified field of view.

    Main Methods:

    • Design of a three-mirror telescope with secondary and tertiary mirrors located behind the primary mirror.
    • Analysis of the optical path to ensure no interruption by mounting structures.
    • Evaluation of image quality, specifically the image blur circle size within a defined field of view.

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    Main Results:

    • The proposed design successfully avoids light path interruption by secondary mirror mounts.
    • Undesirable diffraction sidelobes are effectively eliminated.
    • An image blur circle of less than 3 arcminutes is achieved within a 1° total field of view.

    Conclusions:

    • The designed three-mirror telescope offers a solution for low response to far-off-axis sources.
    • This configuration is particularly suitable for millimeter and submillimeter wavelength applications.
    • The design provides high-quality imaging with minimal stray light interference.