Random lasing in structures with multi-scale transport properties

TL;DR

This paper demonstrates that random lasing properties can be tuned by the topology of the scattering system, specifically in structures with multi-scale transport properties, without changing scattering strength or gain efficiency.

Contribution

It introduces a method to control random laser behavior through structural topology in systems with multi-scale transport properties.

Findings

Lasing properties are tunable via system topology.

Structural lengths influence lasing without altering scattering strength.

Multi-scale transport enables new control over random laser emission.

Abstract

In a random laser (RL), a system possessing in itself both resonator and amplifying medium while lacking of a macroscopic cavity, the feedback is provided by the scattering, which forces light to travel across very long random paths. Here we demonstrate that RL properties may be tuned by the topology of the scattering system retaining unchanged scattering strength and gain efficiency. This is possible in a system based on sparse clusters, possessing two relevant structural lengths: the macroscopic inter cluster separation and the mesoscopic intra-cluster mean free path.