Higher order coefficient measurements in nonlinear absorption process

Intensity-dependent two-photon absorption in chalcogenide glasses has been experimentally observed. Analytical solution of the basic differential equation giving the intensity at the output of the sample is difficult to obtain in this case. A quasi-analytical solution is provided. Second and third-order nonlinear coefficients are deduced from experimental data using Runge–Kutta numerical integration on data obtained via Z-scan technique. Results of the measured higher-order nonlinear coefficients are given. Comparison of these results with those obtained by various approximate analytical solutions of the differential equation is made.

Optimization and limits of optical nonlinear measurements using imaging technique

We report on analytical calculations for a 4f coherent imaging system in presence of a phase object at the entry of the set-up. We give the results of the optimized parameters to be used in this system so as to increase the sensitivity of the measurement of the nonlinear refraction coefficient. Analytical and previously reported simulated image profiles are compared here. Our study also gives the limits of the nonlinear imaging technique with a phase object for relatively high nonlinear phase shifts

Optical and structural properties of new chalcohalide glasses

New class of chalcohalide glasses has been prepared in the GeS2–In2S3–CsI system with regard to their potential non-linear properties. The study of glass-forming region was undertaken to select glassy compositions, which present high non-linear (NL) optical properties with a low two-photon absorption. Thermal analyses, structural examination by Raman spectroscopy, non-linear optical measurements were investigated as a function of CsI contents. Introduction of CsI has shifted the band-gap edge towards the blue region of the absorption optical spectrum and therefore has limited the two-photon absorption. Their NL refractive index n2 are 60 times higher than silica glasses without any NL absorption. Moreover, second harmonic signal was observed in thermally poled samples similar to silica glass. However, this second order non-linearity is not temporally stable

Nonlinear optical measurements using a 4 f coherent imaging system with phase objects

International audienc

Linear and nonlinear optical characterization of tellurium based chalcogenide glasses

International audienc

TWO- AND THREE-PHOTON NONLINEAR ABSORPTION IN As 2 Se 3 CHALCOGENIDE GLASS: THEORY AND EXPERIMENT

International audienc

Linear optical characterization of chalcogenide glasses

International audienc

Experimental evidence of positive and negative nonlinear refractive index change in As/sub 2/Se/sub 3/

International audienc

Experimental and theoretical study of higher-order nonlinearities in chalcogenide glasses

International audienc