Nonlinear propagation of a high-power focused femtosecond laser pulse in air under atmospheric and reduced pressure
| Autor: | A. A. Zemlyanov, Sergei I Kudryashov, Yu. E. Geints, Leonid V. Seleznev, E. S. Sunchugasheva, Andrei A Ionin, D. V. Sinitsyn |
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| Rok vydání: | 2012 |
| Předmět: |
Physics
Atmospheric pressure business.industry Physics::Optics Statistical and Nonlinear Physics Plasma Laser Beam parameter product Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention Optics Physics::Plasma Physics law Femtosecond Physics::Accelerator Physics Laser beam quality Electrical and Electronic Engineering Atomic physics business Beam (structure) Power density |
| Zdroj: | Quantum Electronics. 42:319-326 |
| ISSN: | 1468-4799 1063-7818 |
| DOI: | 10.1070/qe2012v042n04abeh014782 |
| Popis: | This paper examines the propagation of focused femtosecond gigawatt laser pulses in air under normal and reduced pressure in the case of Kerr self-focusing and photoionisation of the medium. The influence of gas density on the beam dimensions and power and the electron density in the plasma column in the nonlinear focus zone of the laser beam has been studied experimentally and by numerical simulation. It has been shown that, in rarefied air, the radiation-induced reduction in the rate of plasma formation diminishes the blocking effect of the plasma on the growth of the beam intensity in the case of tight focusing. This allows higher power densities of ultrashort laser pulses to be reached in the focal waist region in comparison with beam self-focusing under atmospheric pressure. |
| Databáze: | OpenAIRE |
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