Abstract
In this article, the z-scan method has been corrected for the case of saturation in absorption. Using the principle relations of the changes in the transmitted beam through a Kerr sample and Fresnel–Kirchoff integral method, a proper model is offered to evaluate the electric field in any point of the far field. This model contains both the saturation intensity and nonlinear refractive index simultaneously. Based on this study, a precise method to evaluate the nonlinear indices is obtained. Finally, this model is used in the precise study of z-scan curves for γ-Al2O3 nanocolloid and its saturation intensity and nonlinear refractive index have been obtained precisely.
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Koushki, E., Majles Ara, M.H. & Akherat Doost, H. Z-scan technique for saturable absorption using diffraction method in γ-alumina nanoparticles. Appl. Phys. B 115, 279–284 (2014). https://doi.org/10.1007/s00340-013-5602-3
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DOI: https://doi.org/10.1007/s00340-013-5602-3