Raman lasing in a hollow, bottle-like microresonator

TL;DR

This paper demonstrates Raman lasing in a high-Q hollow bottle-like microresonator fabricated from a microcapillary, exploring its threshold dependence on mode volume and potential sensing applications.

Contribution

It introduces a novel fabrication of a hollow, bottle-like microresonator with ultrahigh quality factor and demonstrates Raman lasing at multiple wavelengths, including cascaded lasing.

Findings

Raman lasing achieved at 1.55 μm and 780 nm wavelengths.

Mode volume of the fundamental bottle mode calculated and compared.

Potential application in high-resolution, high-dynamic-range pressure sensing.

Abstract

We report on the fabrication of an ultrahigh quality factor, bottle-like microresonator from a microcapillary, and the realization of Raman lasing therein at pump wavelengths of $1.55~\mathrm{\mu m}$ and $780~\mathrm{nm}$. The dependence of the Raman laser threshold on mode volume is investigated. The mode volume of the fundamental bottle mode is calculated and compared with that of a microsphere. Third-order cascaded Raman lasing was observed when pumped at $780~\mathrm{nm}$. In principle, Raman lasing in a hollow bottle-like microresonator can be used in sensing applications. As an example, we briefly discuss the possibility of a high dynamic range, high resolution aerostatic pressure sensor.