# Polarisation control for optical nanofibres by imaging through a single lens

## TL;DR

This paper introduces a simple, single-lens method for controlling the polarization of light in optical nanofibres by imaging scattered light, achieving high fidelity suitable for constrained environments.

## Contribution

The authors develop a novel polarization control technique using only one lens and imaging of scattered light, simplifying previous methods and enabling applications in restricted spaces.

## Key findings

- Achieved approximately 98% polarization control fidelity.
- Method requires only a single lens and a video camera.
- Effective for nanofibre applications in confined environments.

## Abstract

We present a simple method for controlling the polarisation state of light at the waist of a single-mode optical nanofibre. The method consists of complete polarisation compensation based on imaging scattered light from inherent inhomogeneities both on the fibre surface and in the glass material itself. In contrast to the recently reported protocol exploiting two imaging systems oriented at 45 degrees to each other, our method requires only one lens and a video camera. It is particularly useful for nanofibre-based applications with severe geometric constraints, such as inside vacuum chambers for experiments with cold atoms. The measured fidelity of the achieved control is about 98\% using lenses with moderate numerical apertures.