Frequency-Stabilized Deep-UV Laser at 243.1 nm with 1.4 W output power

TL;DR

This paper reports a high-power, frequency-stabilized deep-UV laser at 243.1 nm with 1.4 W output, achieved through frequency quadrupling and locking to an optical frequency comb, enabling advanced atomic spectroscopy and cooling.

Contribution

The work introduces a stable, high-power deep-UV laser at 243.1 nm with absolute frequency control, suitable for precision atomic experiments, which was not previously demonstrated at this power level.

Findings

Achieved 1.4 W continuous deep-UV laser at 243.1 nm.

Successfully locked the laser to an optical frequency comb.

Enabled excitation of the 1S-2S transition in atomic hydrogen.

Abstract

We demonstrate a 1.4 W continuous wavelength (CW) laser at 243.1 nm. The radiation is generated through frequency quadrupling the output of a ytterbium-doped fiber amplifier system which produces $>$ 10 W of CW power at 972.5 nm. We demonstrate absolute frequency control by locking the laser to an optical frequency comb and exciting the 1S-2S transition in atomic hydrogen. This frequency-stabilized, high-power deep-UV laser should be of significant interest for precision spectroscopy of simple and exotic atoms, two-photon laser cooling of hydrogen, and Raman spectroscopy.