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Continuous-wave whispering-gallery optical parametric oscillator for high-resolution spectroscopy.

Christoph S Werner, Karsten Buse, Ingo Breunig

    Optics Letters
    |February 28, 2015
    PubMed
    Summary

    This study demonstrates continuous operation of a whispering gallery optical parametric oscillator. The device achieves high efficiency and stable output for potential high-resolution spectroscopy applications.

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    Area of Science:

    • Optics and Photonics
    • Nonlinear Optics
    • Laser Physics

    Background:

    • Whispering gallery optical parametric oscillators (OPOs) are promising for nonlinear frequency conversion.
    • Achieving continuous operation and high stability in OPOs remains a challenge.
    • Miniaturized OPOs require precise control over environmental parameters.

    Purpose of the Study:

    • To demonstrate continuous and stable operation of a whispering gallery optical parametric oscillator (OPO).
    • To achieve high conversion efficiency from pump to signal and idler waves.
    • To assess the suitability of the OPO for high-resolution spectroscopy.

    Main Methods:

    • Stabilizing resonator temperature to the millikelvin (mK) level.
    • Locking pump frequency to cavity resonance using the Pound-Drever-Hall technique.
    • Utilizing a millimeter-sized whispering gallery OPO device.

    Main Results:

    • Continuous operation achieved with >50% conversion efficiency for a 1040 nm pump to ~2000 nm signal/idler waves.
    • Signal wave power and frequency stability demonstrated (<±1% and <±25 MHz over 1 hour).
    • Frequency tuning over 480 MHz achieved by temperature control, resolving 10 MHz linewidths.

    Conclusions:

    • The developed whispering gallery OPO offers stable, efficient, and tunable light generation.
    • The device's performance is suitable for demanding high-resolution spectroscopic measurements.
    • Precise temperature and frequency stabilization are key to continuous OPO operation.