Raman lasing and Fano lineshapes in a packaged fiber-coupled whispering-gallerymode microresonator

TL;DR

This paper demonstrates Raman lasing and Fano lineshapes in a packaged fiber-coupled whispering-gallery-mode microresonator, highlighting its potential for portable sensors and stable microlasers in practical environments.

Contribution

It reports the first observation of Raman lasing and Fano lineshapes in a packaged WGM microresonator embedded in a polymer matrix, enabling robust and portable laser-based sensing.

Findings

Supported both single and multimode Raman lasing with low power thresholds.

Observed Fano and EIT-like phenomena in a packaged microresonator.

Potential for high-resolution sensors and slow light applications.

Abstract

We report Raman lasing and the optical analog of electromagnetically-induced-transparency (EIT) in a whispering-gallerymode (WGM) microtoroid resonator embedded in a low refractive index polymer matrix together with a tapered fiber coupler. The Raman laser supports both single and multimode operation with low power thresholds. Observations of Fano and EIT-like pheonomena in a packaged microresonator will enable high resolution sensors and can be used in networks where slow light process is needed. These results open the way for portable, robust, and stable WGM microlasers and laserbased sensors for applications in various environments.