Three orders of magnitude cavity-linewidth narrowing by slow light in a rare-earth-ion-doped crystal cavity

TL;DR

This paper demonstrates a three-order magnitude narrowing of cavity linewidth in a rare-earth-ion-doped crystal cavity by leveraging strong intra-cavity dispersion from off-resonant dopant interactions, enabled by reprogrammable optical pumping.

Contribution

It introduces a novel method of linewidth narrowing using reprogrammable dispersion in rare-earth-ion-doped crystals, advancing cavity quantum optics techniques.

Findings

Achieved three orders of magnitude linewidth narrowing.

Demonstrated reprogrammable dispersion control.

Showed multiple cavity modes within the transmission window.

Abstract

Three orders of magnitude cavity-linewidth narrowing in a rare-earth-ion-doped crystal cavity, induced by strong intra-cavity dispersion caused by off-resonant interaction with dopant ions is demonstrated. The strong dispersion is created by semi-permanent but rapidly reprogrammable changes of the rare earth absorption profiles using optical pumping techniques. Several cavity modes are shown within the spectral transmission window. Potential applications are discussed.