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A mechanically stable and tunable cryogenic Fabry-Pérot microcavity.

Y Fontana1, R Zifkin2, E Janitz3

  • 1Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland.

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We developed a stable microcavity system for quantum optics research inside cryostats. This technology enhances photon-matter interactions by minimizing mechanical vibrations for tunable, high-finesse cavities.

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Area of Science:

  • Quantum Optics and Quantum Information Science
  • Optomechanical Systems
  • Nanophotonics

Background:

  • High-finesse microcavities are crucial for enhancing photon-matter interactions in quantum applications.
  • Mechanical vibrations in closed-cycle cryostats limit the performance of tunable, open-geometry microcavities requiring spatial control and free-space access.

Purpose of the Study:

  • To design and characterize a vibration-isolated system for high-finesse microcavities within a closed-cycle cryostat.
  • To enable stable, tunable cavity operation with spatial positioning and free-space optical access for quantum experiments.

Main Methods:

  • Developed a system with two cascaded vibration isolation stages using leaf springs to decouple motion.
  • Incorporated tuned-mass and magnetic damping to minimize mechanical vibrations (achieving ~16 pm-rms stability).
  • Implemented a technique for in situ measurement of cavity length displacements and vibrations.

Main Results:

  • Achieved passive mechanical stability of ~16 pm-rms for high-finesse mirrors.
  • Demonstrated three-dimensional positioning of the cavity mode and free-space confocal imaging capability.
  • Successfully quantified cavity length displacements and vibrations, with and without active feedback.

Conclusions:

  • The developed system enables stable operation of tunable, high-finesse microcavities within closed-cycle cryostats.
  • This technology is an enabler for cavity coupling to diverse solid-state quantum systems.
  • Facilitates advancements in quantum optics and quantum information science applications.