Coupling a Fabry-P\'erot Cavity to a Single-Mode Optical Fiber Using a Metalens

TL;DR

This paper demonstrates a novel method for efficiently coupling a high-finesse Fabry-Pérot cavity to a single-mode fiber using a metalens, with detailed analysis and a cryo-compatible assembly at 1650 nm.

Contribution

It introduces a metalens-based coupling approach for Fabry-Pérot cavities, including sensitivity analysis and a practical cryo-compatible fiber-coupled cavity design.

Findings

Sensitivity analysis of misalignment errors

Successful demonstration of fiber-coupled cavity at 1650 nm

Potential for improved quantum technology integrations

Abstract

Efficient coupling of light from an optical cavity to a single-mode fiber is required in a range of quantum technologies. In this work we consider the coupling of a high-finesse macroscopic Fabry-P\'erot (FP) cavity to a single-mode fiber using a metalens. We perform sensitivity analysis with respect to longitudinal and transverse misalignment errors. We then detail a fiber-coupled cavity at 1650 nm using a monolithic cryo-compatible assembly incorporating a metalens.