Abstract
Self-compression of high-intensity femtosecond laser pulses and more than an order of magnitude increase of the peak intensity are found in a medium of positive group velocity dispersion based on the lowest order optical processes in the (3+1)-dimensional nonlinear Schrödinger equation. A physical mechanism of the pulse compression and intensity gain in a low-dispersion regime is proposed for the first time. A method of high-intensity femtosecond pulse formation can be developed on this basis.
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