Abstract
The random laser features around threshold in a ground powder of a silica gel containing Rhodamine 6G-doped silica nanoparticles under one- and two-photon excitation are analyzed. The lasing threshold following two-photon pumping is fifty times higher than after one-photon excitation. Theoretical calculations by using a light diffusive propagation model are in agreement with the experimental results.
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Acknowledgments
This work was supported by the Spanish Government MEC (FIS2011-27968 and TEC 2012-37983-C03-01), Basque Country Government (IT-659-13 and IT-664-13), and by the University of the Basque Country (UPV/EHU) through program UFI 11/16. S. G.-R acknowledges the financial support from Research Association MPC for a postdoctoral appointment. The authors are grateful to Dr. M. Al-Saleh for sample preparation and would also like to thank SGIker ARINA from the University of the Basque Country (UPV/EHU) for allocation of computational resources.
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García-Ramiro, B., Illarramendi, M.A., García-Revilla, S. et al. Lasing threshold of one- and two-photon-pumped dye-doped silica powder. Appl. Phys. B 117, 1135–1140 (2014). https://doi.org/10.1007/s00340-014-5936-5
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DOI: https://doi.org/10.1007/s00340-014-5936-5