Self-focusing collapse distance in ultrashort pulses and measurement of nonlinear index |
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Authors: | Whalen P Moloney J V Kolesik M |
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Institution: | College of Optical Sciences, University of Arizona, Tucson, Arizona 85721, USA. |
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Abstract: | We analyze the method of moving focus to determine the critical power for self-focusing by means of numerical simulation and a semianalytical model. It is shown that the original interpretation of a moving focus experiment does not hold in general and that inclusion of defocusing effects due to free electrons is necessary to relate the measured data to critical power. |
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