Ultra-fast dynamics of the refractive index in laser-excited water

P. Palyanov; F. Quere; Ph. Martin; S. Pommeret

doi:10.1117/12.675343

21 April 2006 Ultra-fast dynamics of the refractive index in laser-excited water

P. Palyanov, F. Quere, Ph. Martin, S. Pommeret

Proceedings Volume 6160, Twelfth Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics; 61601P (2006) https://doi.org/10.1117/12.675343
Event: Twelfth Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics, 2005, Tomsk, Russian Federation

Abstract

We report the experimental study of the ultra-fast modification of the dielectric function of pure water by an intense femtosecond laser pulse. Using a time-resolved optical interferometric technique, we measured the variation of the phase shift, which is proportional to the modification of the real part of the refractive index, as well as the variation of the fringes contrast, proportional to the modification of the absorption coefficient. We first observe a positive phase shift due to Kerr effect and immediately followed a negative one. After 200 fs, the phase shift becomes positive and remains so for at least 3 ps. Using the simple Drude -Lorentz model, we interpret this evolution as the result of electron self-trapping.

Citation Download Citation

P. Palyanov, F. Quere, Ph. Martin, and S. Pommeret "Ultra-fast dynamics of the refractive index in laser-excited water", Proc. SPIE 6160, Twelfth Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics, 61601P (21 April 2006); https://doi.org/10.1117/12.675343

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