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Compact harmonic cavity optical parametric oscillator for optical parametric amplifier seeding.

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    |September 10, 2020
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    This summary is machine-generated.

    We developed a compact, efficient frequency conversion system using a harmonic cavity optical parametric oscillator (OPO) and power amplifier. This tunable laser system achieves high efficiency and low noise for advanced optical applications.

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    Area of Science:

    • Nonlinear Optics
    • Laser Physics
    • Solid-State Lasers

    Background:

    • Optical parametric oscillators (OPOs) are crucial for tunable light generation.
    • Achieving high efficiency and low thresholds in OPOs is a key research area.
    • Compact and robust laser systems are needed for practical applications.

    Purpose of the Study:

    • To present a broadly tunable, highly efficient frequency conversion scheme.
    • To demonstrate a compact optical setup using harmonic cavity resonance.
    • To achieve low-threshold oscillation and high-power output.

    Main Methods:

    • Utilized a singly-resonant optical parametric oscillator (OPO) with a cavity length matched to the 10th harmonic of the pump laser.
    • Employed an idler-seeded power amplifier following the OPO.
    • Operated a Yb:KGW solid-state pump laser at 41 MHz repetition rate.

    Main Results:

    • Achieved a low oscillation threshold of 28-100 mW for the OPO.
    • Demonstrated a broad signal tuning range from 1.37 to 1.8 µm.
    • Obtained nearly Watt-level output power from the idler radiation (2.4-4.15 µm) after amplification.
    • Generated clean signal and idler pulses with a time-bandwidth product below 0.4 and 10 dB lower relative intensity noise than the pump laser.

    Conclusions:

    • The harmonic cavity OPO followed by an idler-seeded amplifier offers a highly efficient and compact frequency conversion solution.
    • The system provides tunable, high-quality laser output suitable for various scientific and technological applications.
    • This approach significantly improves upon existing laser systems in terms of compactness, efficiency, and noise performance.