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Photothermal effects in ultra-precisely stabilized tunable microcavities.

Johannes F S Brachmann, Hanno Kaupp, Theodor W Hänsch

    Optics Express
    |September 9, 2016
    PubMed
    Summary

    We enhanced microcavity stability using electronic and photothermal feedback, achieving unprecedented noise reduction. Light-induced effects were explored, revealing self-oscillations at high power.

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    Area of Science:

    • Optics and Photonics
    • Mechanical Engineering
    • Quantum Technology

    Background:

    • High-finesse microcavities are crucial for precision measurements and quantum applications.
    • Mechanical stability is a key challenge for microcavity performance, especially under ambient conditions.
    • Light-matter interactions can significantly influence microcavity dynamics.

    Purpose of the Study:

    • To investigate and improve the mechanical stability of tunable high-finesse microcavities.
    • To explore light-induced effects, including suppression and excitation of mechanical fluctuations.
    • To achieve ultra-precise stabilization for advanced applications.

    Main Methods:

    • Ultra-precise electronic stabilization of the microcavity.
    • Photothermal mirror expansion for high-bandwidth feedback control.

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  • Analysis of mechanical resonances and light-induced instabilities.
  • Optimization of combined electronic and photothermal stabilization techniques.

    • Main Results:

    • Cavity stability improved by nearly two orders of magnitude using photothermal feedback.
    • Observation of self-oscillations in mechanical resonances at high intracavity power.
    • Explanation of phenomena via dynamic photothermal instability and parametric driving.
    • Achieved a feedback bandwidth of 500 kHz and a noise level of 1.1 × 10-13 m rms.

    Conclusions:

    • Combined electronic and photothermal stabilization offers a powerful method for enhancing microcavity mechanical stability.
    • Understanding light-induced effects is critical for controlling microcavity dynamics and preventing instabilities.
    • The achieved noise levels and bandwidth open new avenues for precision sensing and quantum information processing.