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Title: Peculiarities of the spatial focusing of a high-power femtosecond laser pulse in air

The propagation of focused high-power femtosecond laser pulses in air is numerically simulated. The dependences of the effective average size of a focal spot and the maximum achievable radiation intensity in the focal beam waist on the peak power of incident radiation are studied. It is shown that in the regime of nonstationary self-action of radiation, due to photoionisation of the medium and formation of plasma, it becomes impossible to focus radiation into a spot of diffraction-limited size predicted by a linear theory. (nonlinear optical phenomena)
Authors:
;  [1]
  1. Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences, Tomsk (Russian Federation)
Publication Date:
OSTI Identifier:
21466517
Resource Type:
Journal Article
Resource Relation:
Journal Name: Quantum Electronics (Woodbury, N.Y.); Journal Volume: 38; Journal Issue: 12; Other Information: DOI: 10.1070/QE2008v038n12ABEH013860
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AIR; BEAM PROFILES; COMPUTERIZED SIMULATION; DIFFRACTION; FOCUSING; LASERS; PEAK LOAD; PHOTOIONIZATION; PLASMA PRODUCTION; PULSES COHERENT SCATTERING; FLUIDS; GASES; IONIZATION; SCATTERING; SIMULATION