Fiber Fabry-Perot cavity with high finesse

TL;DR

This paper reports the development of a fiber-based Fabry-Perot cavity with extremely high finesse and small mode volume, enabling advanced applications in quantum optics and sensing.

Contribution

It introduces a fiber-based cavity with CO2 laser-machined mirrors achieving high finesse and mode matching, advancing cavity quantum electrodynamics and related fields.

Findings

Achieved finesse of F>=130000

Demonstrated small waist and mode volume

Enabled applications in CQED and single-photon sources

Abstract

We have realized a fiber-based Fabry-Perot cavity with CO2 laser-machined mirrors. It combines very small size, high finesse F>=130000, small waist and mode volume, and good mode matching between the fiber and cavity modes. This combination of features is a major advance for cavity quantum electrodynamics (CQED), as shown in recent CQED experiments with Bose-Einstein condensates enabled by this cavity [Y. Colombe et al., Nature 450, 272 (2007)]. It should also be suitable for a wide range of other applications, including coupling to solid-state emitters, gas detection at the single-particle level, fiber-coupled single-photon sources and high-resolution optical filters with large stopband.