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Nonlinear absorption coefficient measurement of nanofluids using Moire deflectometry technique

Nanoparticles with second-order optical nonlinearities have been widely studied because of their applications in clinical and industrial applications. The nonlinear absorption coefficient is an important parameter which should be determined in order to fully grasp the implications of these materials. In this work Moire deflectometry method is used to measure the nonlinear absorption coefficient of nanoparticles. In the proposed method the divergence of beam is measured instead of measuring the intensity of divergent ray. Two beams are used; one is a comparatively high intensity laser beam which is used as the interacting beam and the other is used as probe, wide beam with low intensity that is radiated to the first beam vertically. By analyzing the probe beam using Moiré deflectometry, the nonlinear absorption coefficient is measured.