A continuous wave 10 W cryogenic fiber amplifier at 1015 nm and frequency quadrupling to 254 nm

TL;DR

This paper presents a stable 10W continuous wave fiber amplifier at 1015 nm, cooled to liquid nitrogen, with frequency quadrupling to 254 nm for mercury spectroscopy, demonstrating a high-power UV source.

Contribution

It introduces a novel cryogenic fiber amplifier system with high power and stability, enabling efficient frequency quadrupling for spectroscopy applications.

Findings

Achieved 10W output power at 1015 nm

Successfully generated 254 nm UV light via frequency quadrupling

Demonstrated application in mercury spectroscopy

Abstract

A stable, continuous wave, single frequency fiber amplifier system at 1015 nm with 10W output power is presented. It is based on a large mode double clad fiber cooled to liquid nitrogen temperature. The amplified light is frequency quadrupled to 254 nm and used for spectroscopy of the 6^1S - 6^3P transition in mercury.