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    Researchers created a tunable optical vortex laser using nonlinear crystals. This laser system achieved an octave-spanning tunability from 735 to 1903 nm, demonstrating significant potential for various optical applications.

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    Area of Science:

    • Optics and Photonics
    • Nonlinear Optics
    • Laser Technology

    Background:

    • Optical vortex lasers are crucial for applications requiring structured light.
    • Developing tunable laser sources with broadband output is a significant challenge in optics.

    Purpose of the Study:

    • To develop an octave-band tunable optical vortex laser.
    • To investigate the performance of a linear-cavity optical parametric oscillator for vortex generation.

    Main Methods:

    • Utilized a 532 nm optical vortex as the pump source.
    • Employed a simple linear-cavity configuration with cascaded non-critical phase-matching Lithium Triborate (LiB3O5) crystals.
    • Achieved optical vortex generation through optical parametric oscillation.

    Main Results:

    • Demonstrated octave-band tunability of the optical vortex output from 735 nm to 1903 nm.
    • Obtained optical vortex pulse energy ranging from 0.24 mJ to 2.36 mJ for a pump energy of 9 mJ.
    • Achieved an optical-to-optical efficiency between 0.3% and 26%.

    Conclusions:

    • The developed system provides a versatile and tunable source of optical vortex beams.
    • The linear-cavity configuration with cascaded LiB3O5 crystals is effective for broadband optical vortex generation.