Yb fiber amplifier at 972.5 nm with frequency quadrupling to 243.1 nm

TL;DR

This paper presents a high-power continuous-wave ytterbium-doped fiber amplifier at 972.5 nm, frequency quadrupled to generate 243.1 nm UV light, enabling precise atomic hydrogen excitation for fundamental physics research.

Contribution

The work demonstrates a novel high-power UV source at 243.1 nm via frequency quadrupling of a fiber amplifier, suitable for atomic physics experiments.

Findings

6.3 W at 972.5 nm achieved

530 mW at 243.1 nm generated

Potential for hydrogen and anti-hydrogen studies

Abstract

We demonstrate a continuous-wave ytterbium-doped fiber amplifier which produces 6.3 W at a wavelength of 972.5 nm. We frequency quadruple this source in two resonant doubling stages to produce 530 mW at 243.1 nm. Radiation at this wavelength is required to excite the 1S-2S transition in atomic hydrogen and could therefore find application in experimental studies of hydrogen and anti-hydrogen.