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Related Concept Videos

Scanning Electron Microscopy01:07

Scanning Electron Microscopy

A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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Published on: July 5, 2016

Scanned beam holography.

J C Palais

    Applied Optics
    |January 16, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Scanned beam holography significantly reduces the stability time needed for creating holograms with continuous-wave (cw) gas lasers. This technique allows for holography of objects previously unsuited for stable platforms, by minimizing mechanical stability requirements.

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    Area of Science:

    • Optics
    • Holography
    • Laser Technology

    Background:

    • Traditional holography requires extreme mechanical stability.
    • Continuous-wave (cw) gas lasers are often used in holographic applications.
    • Maintaining stability for extended periods is a significant challenge.

    Purpose of the Study:

    • To introduce and demonstrate a novel technique for reducing hologram recording time.
    • To decrease the stringent mechanical stability requirements in holographic setups.
    • To enable holography for objects not compatible with conventional stable platforms.

    Main Methods:

    • Implementation of scanned beam holography.
    • Utilizing a cw gas laser system.
    • Experimental validation of the reduced stability time.

    Main Results:

    • Stability time for hologram creation was reduced by a factor of sixteen.
    • The scanned beam method significantly shortens the required coherence time.
    • Elimination of the need for conventional stable platforms is possible in certain applications.

    Conclusions:

    • Scanned beam holography offers a practical solution for reducing stability time.
    • This method expands the range of objects suitable for holographic recording.
    • The technique enhances the feasibility of holography in less controlled environments.