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High mechanical bandwidth fiber-coupled Fabry-Perot cavity
Optics Express
|October 19, 2017
Summary
This study demonstrates a compact fiber-based optical microcavity design achieving a 44 kHz locking bandwidth for high-frequency cavity length stabilization. This breakthrough enhances coupling light to microscopic systems in demanding environments.
Area of Science:
- Optics and Photonics
- Cavity Quantum Electrodynamics
- Mechanical Resonators
Background:
- Fiber-based optical microcavities offer high quality factors and low mode volumes, ideal for light-matter interactions.
- Their low mass suggests potential for high-frequency mechanical response and cavity length stabilization.
Purpose of the Study:
- To demonstrate a high bandwidth stabilization of fiber-based optical microcavity length.
- To develop a simple, compact design compatible with vacuum and cryogenic conditions.
Main Methods:
- Fabrication of a fiber-based optical microcavity.
- Implementation of a feedback control system for cavity length stabilization.
- Measurement of open-loop and closed-loop transfer functions.
- Simulations of the mechanical response.
Main Results:
- Achieved a locking bandwidth of 44 kHz.
- Demonstrated a simple and compact design.
- Confirmed compatibility with vacuum and cryogenic environments.
- Identified limitations and potential improvements through transfer function analysis and simulations.
Conclusions:
- The demonstrated fiber-based microcavity design enables high-bandwidth length stabilization.
- The design's simplicity and environmental compatibility make it suitable for advanced quantum optics experiments.
- Further improvements are possible by addressing identified mechanical and electronic limitations.