Photoluminescence, amplification and generation of optical media in without inversion and of induced radiation

TL;DR

This paper discusses a method of optical amplification and radiation generation in media without the need for population inversion, relying instead on four-photon interactions during optical pumping.

Contribution

It introduces a novel approach to achieve photoluminescence and lasing without inversion through four-photon interactions in doped media.

Findings

Photoluminescence observed without population inversion.

Optical amplification achieved via four-photon interactions.

Generation of radiation in media without the need for inversion.

Abstract

The observation of photoluminescence (PL) or achieve lasing modes in alcohol solutions of dyes or other media (silica glass fibers), doped in small quantities by certain active working elements, which are dipped in the environment, do not requires start the inversion, since the main role in time of the optical pumping process is given four-photon interaction and the associated amplification of those frequency components, that result from this interaction, and participating in the PL or generation.