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How good are collimated Gaussian beams produced with engineered diffusers?

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    Engineered diffusers (EDs) offer efficient Gaussian beam collimation for short-distance applications, despite reduced spatial coherence. This study analyzes their beam quality and propagation characteristics over several meters.

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    Area of Science:

    • Optics and Photonics
    • Laser Beam Shaping
    • Optical Engineering

    Background:

    • Conventional pinhole systems for Gaussian beam collimation suffer from low optical transmission efficiency.
    • Engineered diffusers (EDs), or light shaping diffusers, present an alternative method for beam collimation.
    • EDs provide high optical power throughput but introduce speckle and reduce spatial coherence.

    Purpose of the Study:

    • To enhance the understanding of collimation quality and propagation properties of ED-generated Gaussian beams.
    • To experimentally investigate the performance of EDs for beam collimation in tabletop optical systems.
    • To analyze the impact of EDs on beam characteristics over propagation distances up to a few meters.

    Main Methods:

    • Experimental measurement of beam divergence, Rayleigh distance, and M² factor for ED-produced beams.
    • Analysis of the wavefront radius of curvature (RoC) evolution over propagation distances.
    • Comparison of ED-generated beams with a spatially filtered, near-ideal collimated beam and investigation of speckle reducer (SR) effects.

    Main Results:

    • EDs effectively collimate Gaussian beams, achieving high optical transmission efficiency.
    • Measurements quantified beam divergence, Rayleigh distance, M² factor, and RoC evolution for ED-collimated beams.
    • The study documented beam profile changes with and without a laser speckle reducer (SR).

    Conclusions:

    • EDs are a promising technology for collimating laser beams in systems requiring high optical power throughput over short distances.
    • While EDs reduce spatial coherence and introduce speckle, their efficiency makes them suitable for specific benchtop applications.
    • Further understanding of ED beam propagation properties aids in their effective deployment in optical systems.