Title

Transition from linear-to nonlinear-focusing regime in filamentation

Authors

Authors

Sci Rep

Comments

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Abbreviated Journal Title

Crim. Justice Behav.

Keywords

FEMTOSECOND LASER-PULSES; AIR; PROPAGATION; RANGE; LIGHT; POWER; Multidisciplinary Sciences

Abstract

Laser filamentation in gases is often carried out in the laboratory with focusing optics to better stabilize the filament, whereas real-world applications of filaments frequently involve collimated or near-collimated beams. It is well documented that geometrical focusing can alter the properties of laser filaments and, consequently, a transition between a collimated and a strongly focused filament is expected. Nevertheless, this transition point has not been identified. Here, we propose an analytical method to determine the transition, and show that it corresponds to an actual shift in the balance of physical mechanisms governing filamentation. In high-NA conditions, filamentation is primarily governed by geometrical focusing and plasma effects, while the Kerr nonlinearity plays a more significant role as NA decreases. We find the transition between the two regimes to be relatively insensitive to the intrinsic laser parameters, and our analysis agrees well with a wide range of parameters found in published literature.

Subjects

K. Lim; M. Durand; M. Baudelet;M. Richardson

Volume

4

Publication Date

1-1-2014

Document Type

Article

Language

English

First Page

8

WOS Identifier

WOS:000346257100001

ISSN

2045-2322

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