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Related Experiment Video

Updated: Jun 20, 2026

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

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

Published on: January 28, 2019

Laser-beam apodization with a graded random phase window.

R A Haas, M A Summers, G J Linford

    Optics Letters
    |September 10, 2009
    PubMed
    Summary
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    Random phase modulation can apodize laser beams, preventing diffraction ripples caused by obstacles. This technique effectively eliminates Fresnel-diffraction ripples from laser beams interacting with central obscurations.

    Area of Science:

    • Optics and Photonics
    • Laser Physics

    Background:

    • Fresnel diffraction creates ripples around beam edges or obscurations.
    • Apodization techniques aim to control beam profiles and reduce unwanted diffraction effects.

    Purpose of the Study:

    • To investigate the use of graded random phase modulation for apodizing laser beams.
    • To theoretically analyze the elimination of Fresnel-diffraction ripples caused by a central obscuration.

    Main Methods:

    • Theoretical analysis of a 1-micrometer wavelength laser beam interacting with a central obscuration.
    • Modeling random phase modulation on a window surface downstream of the obstacle.
    • Utilizing Gaussian amplitude transverse correlation and exponential amplitude decrease for modulation parameters.

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    The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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    Published on: August 12, 2013

    Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
    05:57

    Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station

    Published on: April 1, 2020

    Related Experiment Videos

    Last Updated: Jun 20, 2026

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

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

    Published on: January 28, 2019

    The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
    12:14

    The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

    Published on: August 12, 2013

    Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
    05:57

    Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station

    Published on: April 1, 2020

    Main Results:

    • Graded random phase modulation effectively eliminates Fresnel-diffraction ripples.
    • Specific modulation parameters (correlation length l=50 microm, transverse scale length L=500 microm) were found to be effective.
    • Calculations showed general agreement with experimental findings.

    Conclusions:

    • Random phase modulation is a viable method for apodizing laser beams.
    • This technique successfully mitigates diffraction artifacts from beam obstructions.
    • The study provides a theoretical framework and parameters for practical application.