We report our results on random lasing from rhodamine 6G based colloidal gain medium consisting of urchin-like TiO2 structures. Multimode behaviour is observed even at low pump laser powers. Emission linewidth narrowing and lasing threshold are investigated. Coherent back scattering is used to obtain the disorder degree of the sample. This urchin based system is demonstrated to possess lower lasing thresholds and enhanced efficiency with multimode behaviour compared to a TiO2 spherical particle system with same disorder degree. This work opens up a new avenue for low threshold, high efficiency lasing.
Venkata Siva Gummaluri, Radhika V. Nair, and Vijayan C., "Random lasing from a colloidal gain medium with urchin-like TiO2 structures," Proc. SPIE 9920, Active Photonic Materials VIII, 99200G (Presented at SPIE Nanoscience + Engineering: August 28, 2016; Published: 16 September 2016); https://doi.org/10.1117/12.2236335.
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