caa a22 4500 530098873 20181217030327.0 cr unu---uuuuu 181026e20150107xx s 000 0 eng 10.3929/ethz-b-000098834 doi 10.1038/srep07650 doi (ETHRESEARCH)oai:www.research-collection.ethz.ch:20.500.11850/98834 Rapid assessment of nonlinear optical propagation effects in dielectrics [Elektronische Daten] [Jesus Del Hoyo, Alexandro Ruiz De La Cruz, Edward J. Grace, Andrés Ferrer, Jan Siegel, Alessia Pasquazi, Gaetano Assanto, Javier Solis] Sci Rep Open access ethresearch Ultrafast laser processing applications need fast approaches to assess the nonlinear propagation of the laser beam in order to predict the optimal range of processing parameters in a wide variety of cases. We develop here a method based on the simple monitoring of the nonlinear beam shaping against numerical prediction. The numerical code solves the nonlinear Schrödinger equation with nonlinear absorption under simplified conditions by employing a state-of-the art computationally efficient approach. By comparing with experimental results we can rapidly estimate the nonlinear refractive index and nonlinear absorption coefficients of the material. The validity of this approach has been tested in a variety of experiments where nonlinearities play a key role, like spatial soliton shaping or fs-laser waveguide writing. The approach provides excellent results for propagated power densities for which free carrier generation effects can be neglected. Above such a threshold, the peculiarities of the nonlinear propagation of elliptical beams enable acquiring an instantaneous picture of the deposition of energy inside the material realistic enough to estimate the effective nonlinear refractive index and nonlinear absorption coefficients that can be used for predicting the spatial distribution of energy deposition inside the material and controlling the beam in the writing process. Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0 ethresearch Del Hoyo Jesus joint author Ruiz De La Cruz Alexandro joint author Grace Edward J. joint author Ferrer Andrés joint author Siegel Jan joint author Pasquazi Alessia joint author Assanto Gaetano joint author Solis Javier joint author Scientific Reports London : Nature Publishing Group 5, p. 7650 2045-2322 http://hdl.handle.net/20.500.11850/98834 text/html WWW-Backlink auf das Repository (Open access) 1 Journal Article ethresearch ETHRESEARCH 856 40 http://hdl.handle.net/20.500.11850/98834 text/html WWW-Backlink auf das Repository (Open access) ETHRESEARCH 700 1- Del Hoyo Jesus joint author ETHRESEARCH 700 1- Ruiz De La Cruz Alexandro joint author ETHRESEARCH 700 1- Grace Edward J. joint author ETHRESEARCH 700 1- Ferrer Andrés joint author ETHRESEARCH 700 1- Siegel Jan joint author ETHRESEARCH 700 1- Pasquazi Alessia joint author ETHRESEARCH 700 1- Assanto Gaetano joint author ETHRESEARCH 700 1- Solis Javier joint author ETHRESEARCH 773 0- Scientific Reports London : Nature Publishing Group 5, p. 7650 2045-2322 BK010053 XK010053 XK010000 ETHRESEARCH ETHRESEARCH ETHRESEARCH Journal Article Open access