Relativistic interaction of rippled laser beams with plasmas
Anno: 2000
Autori: Asthana MV., Giulietti A., Giulietti D., Gizzi LA., Sodha MS.
Affiliazione autori: CNR, Area Ricerca, Inst Fis Atom & Mol, I-56010 Pisa, Italy
Abstract: An investigation of the growth of a radially symmetrical ripple, superimposed on a Gaussian laser beam in a plasma is presented. Based on WKB and paraxial ray approximation the phenomenon of relativistic self-focusing (RSF) is analytically investigated. The differential equation for beamwidth parameter of rippled laser beam is evaluated. The ripple gets focused when the initial power of the ripple is greater than the critical power for focusing. The focusing is found to be considerably affected by the power of the main beam and the phase angle between the electric vectors of the main beam and the ripple. At higher intensities the saturation effects of nonlinearity become predominant, making the nonlinear refractive index in the paraxial region have slower radial dependence, and thus the ripple extract relatively less energy from its neighborhood. The case of magnetized plasmas is also preliminarily discussed.
Giornale/Rivista: LASER AND PARTICLE BEAMS
Volume: 18 (3) Da Pagina: 399 A: 403
Parole chiavi: laser plasmaDOI: 10.1017/S0263034600183077Citazioni: 12dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-04-28Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui