# Current-feedback-stabilized laser system for quantum simulation experiments using Yb clock transition at 578 nm

## TL;DR

This paper presents a laser system stabilized by current feedback for high-resolution spectroscopy of ytterbium's clock transition at 578 nm, achieving linewidths below 320 Hz for quantum simulation experiments.

## Contribution

The authors developed a simplified, stable laser system at 578 nm using an interference-filter stabilized diode laser with improved frequency stability for Yb clock spectroscopy.

## Key findings

- Laser linewidth less than 320 Hz
- Stable frequency stabilization to ultra-low-expansion cavity
- Successful high-resolution Yb clock transition spectroscopy

## Abstract

We developed a laser system for the spectroscopy of the clock transition in ytterbium (Yb) atoms at 578 nm based on an interference-filter stabilized external-cavity diode laser (IFDL) emitting at 1156 nm. Owing to the improved frequency-to-current response of the laser-diode chip and the less sensitivity of the IFDL to mechanical perturbations, we succeeded in stabilizing the frequency to a high-finesse ultra-low-expansion glass cavity with a simple current feedback system. Using this laser system, we performed high-resolution clock spectroscopy of Yb and found that the linewidth of the stabilized laser was less than 320 Hz.