DocumentCode :
2159944
Title :
Two-photon resonance absorption of relativistic-intensity laser pulses in steep overcritical plasmas
Author :
Mikhailova, J.M. ; Platonenko, V.T.
Author_Institution :
Russian Acad. of Sci., Moscow
fYear :
2007
fDate :
17-22 June 2007
Firstpage :
1
Lastpage :
1
Abstract :
By means of particle-in-cell simulations, a mechanism of the two-photon resonance conversion of the laser energy into electron plasma waves in the interaction of relativistic-intensity laser pulses with overdense laser-induced plasmas is investigated. This conversion is a consequence of the periodic action of the ponderomotive (magnetic) component of Lorentzian force on plasma electrons. When the relativistic-intensity linearly-polarized laser pulse irradiates plasma with the about 4-times overcritical density and steep profile, this action is resonant with electron plasma oscillations at a double-laser frequency. As a result a part of the laser energy is transformed into the energy of plasma waves, hence into the energy of fast electrons. Simulations show that two-photon resonance absorption is efficient when the plasma density scale-length is about or less than the laser wavelength. Moreover, in the case of normal laser incidence the two-photon resonance absorption seems to be the dominant mechanism of overcritical plasma heating.
Keywords :
plasma density; plasma heating by laser; plasma oscillations; plasma production by laser; plasma simulation; two-photon processes; Lorentzian force; electron plasma oscillations; electron plasma waves; laser energy; overcritical plasma heating; overdense laser-induced plasmas; particle-in-cell simulations; plasma density; relativistic-intensity laser pulses; steep overcritical plasmas; two-photon resonance absorption; Absorption; Electrons; Heating; Laser excitation; Laser theory; Magnetic resonance; Optical pulses; Plasma density; Plasma simulation; Plasma waves;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Lasers and Electro-Optics, 2007 and the International Quantum Electronics Conference. CLEOE-IQEC 2007. European Conference on
Conference_Location :
Munich
Print_ISBN :
978-1-4244-0931-0
Electronic_ISBN :
978-1-4244-0931-0
Type :
conf
DOI :
10.1109/CLEOE-IQEC.2007.4386349
Filename :
4386349
Link To Document :
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