संक्षेप / Abstract: Random lasers (RLs) rely on multiple scattering within a gain medium to achieve light amplification, distinct from conventional lasers which employ optical cavities.1 This study investigates the selection of materials and statistical properties of RL systems. Three novel materials as scatterers for RLs are introduced and investigated: electrospun Polyvinylidene Fluoride (PVDF),2 Kaolinite nanoclay,3 and Potassium Sodium Niobate (KNN).4 The successful transition from amplified spontaneous emission (ASE) to coherent random lasing in electrospun PVDF doped with Rhodamine 6G (R6G) dye is demonstrated, with a notable narrowing of the emission linewidth. Effective RL generation in colloidal suspensions of R6G and Kaolinite nanoclay is achieved, emphasizing the importance of optimizing gain and scattering concentrations. The research extends to analyzing the statistical properties of RLs, focusing on replica symmetry breaking (RSB) and L´evy statistics, particularly in Kaolinite and KNN-dye based colloidal RLs. Additionally, the potential of dye-Kaolinite nanoclay RLs for speckle-free imaging is explored, which could address the issue of coherent artifacts in current laser-based imaging techniques. This research advances the understanding of RLs and opens new avenues for applications in optical sensing, phototherapy, and speckle-free imaging.

Keywords:  random lasers, electrospun PVDF, kaolinite nanoclay, potassium sodium niobate, replica symmetry breaking, l´evy statistics, rhodamine 6G

References

1. Wiersma D S 2008 Nature physics 4 359–367
2. Padiyakkuth N, Antoine R and Kalarikkal N 2022 Journal of Luminescence 252 119296
3. Padiyakkuth N, Antoine R and Kalarikkal N 2022 Optical Materials 129 112408
4. Nideesh P, Lekha C C, Antoine R and Kalarikkal N 2024 Optics & Laser Technology 169

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