skip to main content

Title: Influence of the laser beam size on the length of a filament formed by high-power femtosecond laser radiation in air

The single-filamentation regime of GW femtosecond laser beams of millimetre diameter, propagating in atmospheric air under collimated and tight focusing, has been theoretically and experimentally (at wavelengths of 800 and 400 nm) investigated. The influence of the initial size of the light beam on the spatial characteristics of the filamentation region is systematically analysed. The filamentation length for collimated beams with the same initial power is found to nonmonotonically depend on the initial beam radius. In this case, the filament start point is displaced, and the longitudinal continuity of the related plasma channel is lost. For tightly focused beams, the observed filament length barely depends of the initial beam radius, provided that the peak intensity remains constant. (interaction of radiation with matter)
Authors:
; ; ;  [1] ;  [2]
  1. V.E. Zuev Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences, Tomsk (Russian Federation)
  2. Far Eastern Federal University, Vladivostok (Russian Federation)
Publication Date:
OSTI Identifier:
22375921
Resource Type:
Journal Article
Resource Relation:
Journal Name: Quantum Electronics (Woodbury, N.Y.); Journal Volume: 44; Journal Issue: 5; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AIR; BEAM OPTICS; FOCUSING; LASER RADIATION; LASERS; NEAR INFRARED RADIATION; PLASMA; VISIBLE RADIATION