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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Tunable vortex beam generation using an optical parametric oscillator with an antiresonant-ring interferometer.

Varun Sharma, S Chaitanya Kumar, G K Samanta

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    |July 1, 2021
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    We developed a tunable picosecond optical vortex source using an antiresonant-ring optical parametric oscillator. This high-power near-infrared source offers stable output for advanced laser applications.

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    Area of Science:

    • Laser Physics and Photonics
    • Nonlinear Optics
    • Quantum Optics

    Background:

    • Development of high-power, tunable ultrashort pulsed laser sources is crucial for various scientific and technological applications.
    • Optical vortex beams, characterized by a helical phase front, offer unique properties for applications in microscopy, optical manipulation, and information processing.
    • Existing optical parametric oscillator (OPO) technologies often face limitations in power, tunability, or beam quality for generating optical vortices.

    Purpose of the Study:

    • To report a novel high-average-power picosecond optical vortex source.
    • To demonstrate tunability in the near-infrared region.
    • To achieve stable and high-quality vortex beam generation.

    Main Methods:

    • Integration of an antiresonant-ring (ARR) interferometer within an optical parametric oscillator (OPO) cavity.
    • Utilizing an external cylindrical lens for astigmatic mode conversion to generate the optical vortex.
    • Characterization of the output power, tunability, beam profile, and pulse properties.

    Main Results:

    • The ARR OPO system is tunable in the signal from 1457-1647 nm, producing optical vortex beams with up to 1 W average power at 1602 nm.
    • The corresponding idler beam is tunable from 3006-3945 nm with a Gaussian profile and up to 1.6 W average power at 3168 nm.
    • Passive power stability better than 1.7% rms (signal) and 1.3% rms (idler) was achieved over 1 hour, with signal pulse durations <19 ps.

    Conclusions:

    • The developed antiresonant-ring optical parametric oscillator is a viable platform for generating high-average-power, tunable picosecond optical vortex beams.
    • The source demonstrates excellent power stability and good temporal characteristics, suitable for demanding applications.
    • This work advances the capabilities of ultrashort pulsed vortex laser sources in the near-infrared spectral region.