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Related Experiment Video

Updated: Jun 22, 2025

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Reducing beam tracking complexity using a phase ramp and Fresnel lens when steering beams using spatial light

Joshua Spaander, Jian Guo, Rudolf Saathof

    Optics Letters
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    A new method uses defocused laser beams with a phase ramp and Fresnel lens (PRFL) phase screen to reduce unwanted light clutter. This simple technique maintains beam tracking performance for improved laser communication systems.

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    Area of Science:

    • Optics and Photonics
    • Optical Communications
    • Laser Beam Steering

    Background:

    • Spatial light modulators (SLMs) are used for laser beam steering.
    • Unmodulated diffraction and reflections from SLMs create clutter, hindering beam tracking.
    • Existing methods for clutter reduction can be complex or require additional hardware.

    Purpose of the Study:

    • To propose a novel and simple beam steering methodology.
    • To reduce the influence of unwanted diffraction and reflections (clutter).
    • To maintain or improve beam tracking performance in multi-beam laser communication.

    Main Methods:

    • Deliberately defocusing laser beams before steering.
    • Applying a superposition of a phase ramp and Fresnel lens (PRFL) phase screen on the SLM.
    • Utilizing standard peak intensity and center of gravity (CG) algorithms for tracking.

    Main Results:

    • Relative intensity of non-modulated reflections and diffracted light is decreased.
    • Tracking performance using PRFL is on-par with complex filtering approaches.
    • No additional hardware is required for the PRFL method.

    Conclusions:

    • The PRFL method effectively reduces clutter in SLM-based beam steering.
    • This technique allows for simple and robust beam tracking.
    • The method has significant potential to enhance multi-beam laser communication systems.