# Polychromatic, continuous-wave mirrorless lasing from monochromatic pumping of cesium vapor

## TL;DR

This paper demonstrates simultaneous mirrorless lasing at multiple wavelengths in cesium vapor using monochromatic pumping, revealing complex decay pathways and diverse emission properties in the IR and blue spectra.

## Contribution

It introduces a novel method for achieving multi-wavelength mirrorless lasing in cesium vapor through resonant continuous-wave pumping, expanding the understanding of atomic decay pathways and lasing mechanisms.

## Key findings

- Lasing observed in at least seven IR wavelengths and two blue wavelengths.
- Lasing properties include power, directionality, and linewidth.
- Multiple decay paths enable simultaneous multi-wavelength emission.

## Abstract

We report on studies of simultaneous continuous-wave mirrorless lasing on multiple optical transitions, realized by pumping hot cesium vapor with laser light resonant with the 6$S_{1/2}\rightarrow 8$P$_{3/2}$ transition. The multiplicity of decay paths for the excited atoms to their ground state is responsible for the emergence of lasing in a number of transitions, observed here in at least seven wavelengths in the infrared (IR), and at two wavelengths in the blue. We study the properties of the fields generated in the cesium vapor, such as optical power, directionality and optical linewidth.