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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Optical frequency combs in dispersion-controlled doubly resonant second-harmonic generation.

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    We demonstrate optical frequency comb generation using doubly resonant intracavity second harmonic generation (SHG). This study explores comb dynamics and thermal effects, aiding the design of chip-scale quadratic comb generators.

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    Area of Science:

    • Nonlinear Optics
    • Quantum Optics
    • Laser Physics

    Background:

    • Intracavity nonlinear processes, like second harmonic generation (SHG), benefit from multiple resonating fields.
    • Simultaneous resonance of fundamental and second harmonic fields, along with phase matching, presents technical challenges.

    Purpose of the Study:

    • To experimentally realize and systematically study optical frequency comb generation in a doubly resonant intracavity SHG system.
    • To investigate the dynamics of comb structures and the influence of thermal effects.
    • To provide a framework for designing chip-scale quadratic comb generators.

    Main Methods:

    • Utilizing an intracavity dispersive element and a piezo-mounted mirror to independently control resonance conditions for fundamental and second harmonic fields.
    • Employing laser-to-cavity detuning to observe steady comb emission.
    • Conducting numerical simulations incorporating photothermal effects to model comb dynamics.

    Main Results:

    • Achieved independent control over resonance conditions without compromising quasi-phase matching.
    • Observed steady comb emission across the entire resonance profile, revealing diverse comb structures.
    • Demonstrated the significant role of thermal effects in comb dynamics.
    • Numerical simulations showed good agreement with experimental findings.

    Conclusions:

    • The developed system enables exploration of comb dynamics in doubly resonant SHG.
    • The findings assist in the design of efficient, chip-scale quadratic comb generators.
    • Independent control of resonance and thermal effects are crucial for comb generation.