Abstract
A theoretical analysis of a low power Gaussian field propagating in unbiased self-defocussing photorefractive media that includes both real and imaginary components of the intensity-dependent refractive index is presented. The analysis, which is in excellent agreement with experimental observations, shows that the imaginary component of the intensity-dependent refractive index can have a focussing effect independent of the focussing or defocussing effect of the real component of the intensity-dependent refractive index. These findings suggest that the imaginary component of the intensity-dependent refractive index is the cause of the previously observed apparent self-focussing in unbiased self-defocussing photorefractive media.
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Jones, M.W., Jaatinen, E. & Michael, G.W. Propagation of low-intensity Gaussian fields in photorefractive media with real and imaginary intensity-dependent refractive index components. Appl. Phys. B 103, 405–411 (2011). https://doi.org/10.1007/s00340-010-4309-y
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DOI: https://doi.org/10.1007/s00340-010-4309-y