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Updated: Jun 19, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Diffractive beam splitter for laser Doppler velocimetry.

J Schmidt, R Völkel, W Stork

    Optics Letters
    |October 3, 2009
    PubMed
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    This study demonstrates a compact sensor for fluid velocity measurement using laser Doppler velocimetry. It utilizes holographic optical elements for precise beam control, ensuring accuracy despite laser variations.

    Area of Science:

    • Optics and Photonics
    • Fluid Dynamics
    • Sensor Technology

    Background:

    • Accurate measurement of fluid velocities is crucial in various scientific and industrial applications.
    • Traditional laser Doppler velocimetry systems can be bulky and sensitive to laser fluctuations.

    Purpose of the Study:

    • To demonstrate a miniaturized sensor head for optical fluid velocity measurement.
    • To explore the use of holographic optical elements for improved sensor performance.

    Main Methods:

    • Development of a miniaturized sensor head incorporating holographic optical elements (HOEs) on a glass substrate.
    • Utilizing volume holograms in dichromated gelatin for beam splitting and deflection.
    • Implementing diffractive devices to achieve achromatic behavior.

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    Last Updated: Jun 19, 2026

    Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
    08:39

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    Published on: January 28, 2019

    Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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    Direct Imaging of Laser-driven Ultrafast Molecular Rotation

    Published on: February 4, 2017

    High-speed Continuous-wave Stimulated Brillouin Scattering Spectrometer for Material Analysis
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    Main Results:

    • Successful demonstration of a compact sensor head for laser Doppler velocimetry.
    • Achieved 75% transmission efficiency with a cascade of two holographic optical elements.
    • The sensor exhibited insensitivity to wavelength drifts and mode hopping of semiconductor lasers due to achromatic design.

    Conclusions:

    • Miniaturized holographic optical elements offer an effective solution for fluid velocity sensing.
    • The developed sensor provides a robust and accurate method for fluid velocity measurements.
    • The achromatic nature of the diffractive devices enhances sensor reliability in diverse operating conditions.