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Experimental evaluation of speckle suppression efficiency using a moving 2D Barker code DOE.

A Lapchuk, O V Shyhovets, A Kryuchyn

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
    |December 11, 2013
    PubMed
    Summary

    This study experimentally evaluated speckle suppression using a moving 2D Barker code diffractive optical element (DOE). While achieving a speckle contrast of 4.4-5.3%, experimental results slightly deviated from theoretical predictions, suggesting optical setup optimization is key.

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    Area of Science:

    • Optics and Photonics
    • Diffractive Optics
    • Speckle Reduction Techniques

    Background:

    • Laser speckle is an inherent interference pattern that degrades image quality in optical systems.
    • Diffractive optical elements (DOEs) offer a promising approach for controlling and reducing speckle.
    • Moving 2D Barker code DOEs present a novel method for dynamic speckle suppression.

    Purpose of the Study:

    • To experimentally evaluate the efficiency of speckle suppression using a moving 2D Barker code diffractive optical element (DOE).
    • To present the optical setup and parameters for the proposed speckle suppression method.
    • To compare experimental findings with theoretical predictions and identify discrepancies.

    Main Methods:

    • Implementation of a novel optical setup utilizing a moving 2D Barker code DOE.
    • Experimental measurement of speckle contrast and speckle suppression coefficient (k).
    • Comparison of experimental speckle suppression performance against theoretical models.

    Main Results:

    • Achieved a speckle contrast of approximately 4.4-5.3% in experimental evaluations.
    • Obtained a speckle suppression coefficient (k) greater than 8.
    • Observed experimental results for the speckle suppression coefficient were approximately 1.5 times lower than theoretical predictions.

    Conclusions:

    • The experimental evaluation demonstrates the feasibility of using moving 2D Barker code DOEs for speckle suppression.
    • Discrepancies between theoretical and experimental results are attributed to potential mismatches in the optical setup and optimal parameters.
    • Optimization of the optical scheme is expected to yield speckle suppression closer to theoretical predictions.