Light diffusion with gain and random lasers

TLDR

An amplifying random medium can exhibit various processes. The paper presents calculations on light diffusion with amplification to explain spontaneous‑emission experiments and argues that three scattering‑dependent regimes exist in random laser action. The authors model light diffusion with gain, discuss experimental realization of a multiply scattering, amplifying medium, and analyze the three regimes. They identify three regimes determined by scattering strength that influence random‑laser behavior. © 1996 The American Physical Society.

Abstract

In this paper we present calculations on light diffusion with amplification that can explain previous experiments on the spontaneous emission from such a medium. Also we discuss the experimental considerations on realizing a medium that both multiply scatters and amplifies light. In an amplifying random medium different processes can occur. We argue that one can distinguish three regimes depending on the amount of scattering, and discuss these regimes in the context of random laser action. \textcopyright{} 1996 The American Physical Society.