Random lasing from a colloidal gain medium with urchin-like TiO2 structures

Venkata Siva Gummaluri; Radhika V. Nair; Vijayan C.

doi:10.1117/12.2236335

16 September 2016 Random lasing from a colloidal gain medium with urchin-like TiO₂ structures

Venkata Siva Gummaluri, Radhika V. Nair, Vijayan C.

Proceedings Volume 9920, Active Photonic Materials VIII; 99200G (2016) https://doi.org/10.1117/12.2236335
Event: SPIE Nanoscience + Engineering, 2016, San Diego, California, United States

Abstract

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.

Conference Presentation

Citation Download Citation

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 (16 September 2016); https://doi.org/10.1117/12.2236335

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