Random Laser Action in Dye-Doped Polymer Media with Inhomogeneously Distributed Particles and Gain

Abstract

The properties of random lasing are investigated for bubble-structure (BS) dye-doped polymer random media in which non-scattering and no-gain regions are distributed. Experimental results demonstrate that, for BS random media, spectral narrowing and a decrease in the number of spectral spikes occur for incoherent and coherent random lasing, respectively, resulting in an increase in the spectral peak intensity in both cases. These features were observed owing to the differences in the diffusion properties of the pumping and emitted lights.

Naturally Occurring Halloysite Nanotubes as Light Scatterers for Stable Random Lasing Applications

“…RL emission performance of HNT1 and HNT2 is expected to be identical because of their similar linear optical properties around ∼600 nm. Anyway, inhomogeneity in the distribution of the scatterer may lead to a slight improvement in the P in Th , − as we have observed for HNT1-RhB.…”

10th Laser Display and Lighting Conference: Abstract Book

“…Spacer particles (non-scattering regions) dispersed in random gain media increase the spectral peak intensity for both coherent and incoherent random lasing [11]. This peak enhancement occurs even when the spacer particles have no gain [12].…”

Emission properties of random lasers with scatterer distribution formed by optical trapping

“…When a laser beam is focused into a particulate medium, scatterers near the focused spot are pulled into the beam waist region, forming a non-uniform distribution of scatterers 4,5 . Earlier studies demonstrated that spacer particles (non-scattering regions) dispersed in a random gain medium increase the peak intensity of the emission spectrum 6,7 . In this study, we realize another inhomogeneous scatterer distribution, that is, localized high-density scatterer regions and low-density surrounding regions, by optical trapping.…”