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Related Concept Videos

Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

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Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over...
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Related Experiment Video

Updated: May 1, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Laser beam complex amplitude measurement by phase diversity.

Nicolas Védrenne, Laurent M Mugnier, Vincent Michau

    Optics Express
    |March 26, 2014
    PubMed
    Summary

    A new method, Complex Amplitude MEasurement by a Likelihood Optimization Tool (CAMELOT), accurately measures laser beam complex amplitude, even for highly perturbed beams. This technique is crucial for controlling laser optical quality with strong variations.

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    Area of Science:

    • Optics and Photonics
    • Laser Beam Characterization
    • Wavefront Sensing

    Background:

    • Controlling laser beam optical quality necessitates precise complex amplitude measurement.
    • Existing methods struggle with significant modulus variations and highly perturbed wavefronts.

    Purpose of the Study:

    • To introduce and validate a novel method for complex amplitude measurement of laser beams.
    • To address the limitations of current techniques in characterizing beams with strong optical perturbations.

    Main Methods:

    • Development of Complex Amplitude MEasurement by a Likelihood Optimization Tool (CAMELOT).
    • Acquisition and processing of multiple beam section images along the optical path.
    • Maximum a Posteriori error metric minimization for complex amplitude retrieval.

    Main Results:

    • CAMELOT effectively retrieves complex amplitude for highly perturbed laser beams.
    • Experimental validation shows good agreement for both beam modulus and phase.
    • Numerical simulations investigate the precision of the experimental measurements.

    Conclusions:

    • CAMELOT offers a robust solution for complex amplitude measurement in challenging laser beam conditions.
    • The method extends phase diversity principles for enhanced beam characterization.
    • Validated CAMELOT provides accurate and precise optical quality control for laser systems.