Random Laser Emission at Dual Wavelengths in a Donor-Acceptor Dye Mixture Solution

TL;DR

This study demonstrates simultaneous dual-wavelength random laser emission in a dye mixture solution with scattering centers, highlighting energy transfer mechanisms and threshold dependencies in weakly scattering systems.

Contribution

It introduces a novel dual-wavelength random laser in a dye mixture with scattering particles, emphasizing energy transfer and threshold behavior.

Findings

Dual-wavelength lasing achieved at 90 nm apart

Lasing thresholds similar for donor and acceptor dyes

Random lasing observed despite inefficient pumping

Abstract

The work was aimed to generate random laser emissions simultaneously at two wavelengths in a weakly scattering system containing mixture of binary dyes, rhodamine-B (Rh-B) and oxazine-170 (O-170) dispersed with ZnO nano-particles served as scattering centres. Random lasing performances for individual Rh-B dye were extensively studied for varying small signal gain/scatterer density and found lasing threshold significantly depend upon number density of dispersed nano-particles. In spite of inefficient pumping, we demonstrated possibility of random lasing in O-170 dye solution on account of resonance energy transfer from Rh-B dye served as donor. At optimum concentrations of fluorophores and scatterer in dye mixture solution, incoherent random lasing was effectively attained simultaneously at two wavelengths centered 90 nm apart. Dual-emission intensities, lasing thresholds and rate of amplifications were found to be equivalent for both donor and acceptor in dye mixture solution.