Abstract
We report the observation of self-action phenomena, such as self-focusing, self-defocusing, self-phase modulation and beam fanning in Roselle-Hibiscus Sabdariffa solutions. This material is found to be a new type of natural nonlinear media, and the nonlinear reflective index coefficient has been determined using a Z-scan technique and by measuring the critical power for the self-trapping effect. Z-scan measurements show that this material has a large negative nonlinear refractive index, n 2 = 1 × 10−4 esu. A comparison between the experimental n 2 values and the calculated thermal value for n 2 suggests that the major contribution to nonlinear response is of thermal origin.
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Henari, F.Z., Al-Saie, A. Nonlinear refractive index measurements and self-action effects in Roselle-Hibiscus Sabdariffa solutions. Laser Phys. 16, 1664–1667 (2006). https://doi.org/10.1134/S1054660X06120115
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DOI: https://doi.org/10.1134/S1054660X06120115