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Related Concept Videos

Beams01:30

Beams

1.4K
Beams are integral components of structural engineering and construction, designed to support loads applied at various points along their length. These long, straight members can be classified based on geometry, cross-section, support type, and equilibrium condition.
Based on geometry, beams can be straight, tapered, or curved. Straight beams are the most common type and have a constant cross-section throughout their length. Tapered beams, on the other hand, have a varying cross-section along...
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Related Experiment Video

Updated: Sep 11, 2025

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Bessel beams with an adjustable focal position.

Keren Zhalenchuck, Alon Bahabad

    Applied Optics
    |August 12, 2025
    PubMed
    Summary

    Researchers developed a novel method to dynamically adjust Bessel beam focal positions. This technique maintains the beam

    Area of Science:

    • Optics and Photonics
    • Beam Shaping Technology

    Background:

    • Bessel beams offer unique non-diffracting properties.
    • Controlling the focal position of Bessel beams dynamically is challenging.
    • Existing methods often alter beam characteristics.

    Purpose of the Study:

    • To introduce a simple method for dynamic focal position control of Bessel beams.
    • To achieve focal position modulation without affecting non-diffraction length or intensity profile.
    • To enable versatile applications in microscopy and optical trapping.

    Main Methods:

    • Generating Bessel beams in Fourier space via an annular aperture.
    • Incorporating a radial grating with tunable periodicity onto the aperture.
    • Dynamically adjusting the grating's periodicity to modify focal position.

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    Last Updated: Sep 11, 2025

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    Main Results:

    • Successfully demonstrated dynamic focal position adjustment of Bessel beams.
    • Preserved the non-diffraction length and intensity profile during focal modulation.
    • The method is simple and requires minimal optical components.

    Conclusions:

    • The presented method offers a straightforward approach to dynamic Bessel beam focusing.
    • This technique enhances the utility of Bessel beams in advanced optical applications.
    • Potential for significant impact in fields like optical microscopy and particle manipulation.