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Rashidian Vaziri M R. Finding the Z-scan relations for nonlinear media with nonlocal response. ICOP & ICPET _ INPC _ ICOFS 2014; 20 :721-724
URL: http://opsi.ir/article-1-304-en.html
URL: http://opsi.ir/article-1-304-en.html
Atomic Energy Organization of Iran
Abstract: (5626 Views)
In this paper, the used relations for obtaining the nonlinear refractive index of nonlinear samples have been generalized by considering the possibility of their nonlocal response to the applied laser radiation in Z-scan experiments. This is made possible by introducing a nonlocal parameter in the nonlinear photoinduced phase shift between the impinging and outgoing Gaussian beams from a nonlocal nonlinear sample. This phase shift has been optimized to be appropriate for describing the Z-scan results of samples with thicknesses much smaller than the Rayleigh length of the Gaussian beams (thin samples). Using this kind of phase shift, the basic formulae for the on-axis Gaussian beam transmittance in the far-field and peak-to-valley separation distance and transmittance difference have been provided. A simple method has been devised for obtaining the nonlinear index of refraction as well as the nonlocal parameter from the Z-scan curves and the main criterion for the applicability of our model has been established in terms of the measurable Z-scan data.
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