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In this work we have introduced a new interferometric technique for measuring the nonlinear refractive index in different samples. Adopting a holographic point of view we have developed a mathematical theory for this technique which is based on the propagation of a Gaussian wave through a small phase aperture.
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Hamid Reza Khalesifard, Ahmad Darudi, Mohammad Taghi Tavassoly, "Application of two-wave mixing for interferometric nonlinear refractive index measurement," Proc. SPIE 3745, Interferometry '99: Applications, (17 August 1999); https://doi.org/10.1117/12.357767