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We developed a laser system for the spectroscopy of the clock transition inytterbium (Yb) atoms at 578 nm based on an interference-filter stabilizedexternal-cavity diode laser (IFDL) emitting at 1156 nm. Owing to the improvedfrequency-to-current response of the laser-diode chip and the less sensitivityof the IFDL to mechanical perturbations, we succeeded in stabilizing thefrequency to a high-finesse ultra-low-expansion glass cavity with a simplecurrent feedback system. Using this laser system, we performed high-resolutionclock spectroscopy of Yb and found that the linewidth of the stabilized laserwas less than 320 Hz.

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