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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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Intracavity spatial mode conversion by holographic phase masks.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Materials Science

    Background:

    • Traditional beam-shaping methods often rely on monochromatic phase profiles and face manufacturing challenges.
    • Existing active and passive devices have limitations including monochromaticity and laser-induced damage thresholds.
    • Holographic phase masks (HPMs) offer a novel passive solution for beam transformation.

    Purpose of the Study:

    • To demonstrate the integration of HPMs into a laser cavity for generating arbitrary spatial modes.
    • To showcase the capability of HPMs for multiplexing distinct spatial modes.
    • To investigate the achromatic properties of HPMs for broadband applications.

    Main Methods:

    • Integration of HPMs within a laser cavity.
    • Characterization of emitted spatial modes and their phase profiles.
    • Testing in a wavelength-tunable cavity to confirm achromatic behavior.

    Main Results:

    • Successful generation of arbitrary spatial modes using intracavity HPMs.
    • Demonstration of simultaneous emission of distinct spatial modes via HPM multiplexing.
    • Confirmation of the achromatic nature of HPMs across a tunable wavelength range.
    • HPMs demonstrated capability to withstand high average power (kW level).

    Conclusions:

    • Intracavity HPMs provide a versatile platform for generating tailored laser beams.
    • The achromatic and high-power handling capabilities of HPMs pave the way for advanced broadband light sources.
    • Future applications include generating beams with arbitrary phase distributions across UV to NIR spectral regions.