Random lasing in rhodamine 6G dye - Kaolinite nanoclay colloids under single shot nanosecond pumping

Abstract

Random lasers [RLs] are mirror-less light sources where feedback emanates from multiple scattering at the expense of spatial coherence and directionality. One of the most straightforward ways to build a random laser [RL] is by preparing a solution of a laser dye, which has a significantly large quantum yield with suspended scatterers (Colloidal based random lasers). Here we showed that rhodamine 6 g (R6G) dye in methanol with Kaolinite nanoclay (scatterer) together could serve the purpose of a disordered active medium. It performs as a good novel platform for colloidal RLs. We investigated the dependence of the concentration of gain medium and scatterers in Kaolinite nanoclay colloidal RLs under single-shot nanosecond pumping. Line width narrows down to ≈5 nm above a threshold of 40 μJ per pulse for a particular concentration of gain and scatterer. Finally, narrowing and beta factors (β) are also calculated for further quantification.