Condition for stopping the collapse of high-power femtosecond laser pulses during propagation through an optical medium

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Сondition for stopping the collapse of high-power femtosecond laser pulses during propagation through an optical medium	653 KB	Adobe Acrobat PDF	Read	Download
DOI Доступ к ресурсу на сайте издателя			10.1134/S102485602304019X

Title: Condition for stopping the collapse of high-power femtosecond laser pulses during propagation through an optical medium
Creator: Zemlyanov, Alexander A.
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Minina, Olga V.
Date: 2023
DOI: 10.1134/S102485602304019X
Description: An intensity collapse stopping criterion is determined in the approximation of the nonlinear Schrödinger equation for the problem of self-focusing of high-power femtosecond laser radiation in an optical medium. Using propagation of a femtosecond laser pulse in air as an example, it is shown that the collapse stops when the role of diffraction increases due to a decrease in the laser beam radius, and this occurs not at a point, but in a segment before a nonlinear focus, where the radiation self-phase modulation due to the plasma nonlinearity prevails over the Kerr effect. The result (collapse stopping criterion) makes it possible to take into account nonlinear effects of optical media during propagation of high-power femtosecond laser pulses through them. In particular, the role of nonlinear absorption is determined under the conditions considered