Characterization of the thermal refraction in ionic liquids induced by a train of femtosecond laser pulses

E. López Lago; J. A. Nóvoa; D. Nóvoa; H. Michinel; O. Cabeza; J. R. Rodríguez; L. M. Varela

doi:10.1117/12.2026234

18 November 2013 Characterization of the thermal refraction in ionic liquids induced by a train of femtosecond laser pulses

E. López Lago, J. A. Nóvoa, D. Nóvoa, H. Michinel, O. Cabeza, J. R. Rodríguez, L. M. Varela

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Proceedings Volume 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications; 87854S (2013) https://doi.org/10.1117/12.2026234
Event: 8th Ibero American Optics Meeting/11th Latin American Meeting on Optics, Lasers, and Applications, 2013, Porto, Portugal

Abstract

We investigate the nonlinear refraction induced by a train of ultrashort laser pulses (repetition rate 80.75MHz) in a set of ionic liquids: [EMIM][BF₄], [BMIM] [BF₄], [HMIM] [BF₄], [OMIM] [BF₄] and [DMIM] [BF₄]. Due to the high repetition rate, linear absorption processes are developed which cause a non local increase of temperature that generates an inhomogeneous and non local spatial variation of the refractive index. This effect is known as thermal refraction. The goal of this work is to characterize by z-scan the induced changes in the refractive index at λ=810nm and to determine the thermooptic coefficient of this liquids at this wavelength

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E. López Lago, J. A. Nóvoa, D. Nóvoa, H. Michinel, O. Cabeza, J. R. Rodríguez, and L. M. Varela "Characterization of the thermal refraction in ionic liquids induced by a train of femtosecond laser pulses", Proc. SPIE 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 87854S (18 November 2013); https://doi.org/10.1117/12.2026234

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