# Ultraviolet Fabry-Perot cavity with stable finesse under ultrahigh vacuum conditions

## TL;DR

This paper presents a UV Fabry-Perot cavity with stable finesse in ultrahigh vacuum, achieved by eliminating organic materials, maintaining performance over 9 months, which is significant for long-term quantum optics experiments.

## Contribution

The authors demonstrate a UV optical cavity with stable finesse in ultrahigh vacuum by avoiding organic materials, ensuring long-term stability unlike previous designs.

## Key findings

- Cavity maintained high finesse over 9 months
- Elimination of organic materials prevents performance degradation
- Stable UV cavity suitable for quantum applications

## Abstract

We have constructed an apparatus containing a linear ion trap and a high-finesse optical cavity in the ultraviolet spectral range. In our construction, we have avoided all organic materials inside the ultrahigh vacuum chamber. We show that, unlike previously reported, the optical cavity does not degrade in performance over a time scale of 9 months.