Broadband Continuous Spectral Control of a Single Wavelength Polymer-Based Solid-State Random Laser

TL;DR

This paper presents a temperature-controlled method for continuously tuning the spectral output of a single-wavelength random laser in a polymer-based solid-state medium, achieving an 8nm wavelength shift.

Contribution

It introduces a novel approach to spectral control of a single-wavelength random laser using temperature-induced refractive index changes in a polymer-dye system.

Findings

Achieved low-threshold, single-mode random lasing with high side lobes rejection.

Demonstrated continuous wavelength tuning over 8nm bandwidth.

Showed temperature-induced blue-shift of the lasing mode.

Abstract

We demonstrate temperature-controlled spectral tunability of a partially-pumped single-wavelength random laser in a solid-state random laser based on DCM (4-dicyanomethylene-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran) doped PMMA (polymethyl methacrylate) dye. By carefully shaping the spatial profile of the pump, we first achieve low-threshold, single-mode random lasing with excellent side lobes rejection. Notably, we show how temperature-induced changes in the refractive index of the PMMA-DCM layer result in a blue-shift of this single lasing mode. Continuous tunability of the lasing wavelength is demonstrated over an 8nm-wide bandwidth.