Broadening and shift of emission lines in a plasma of filaments generated by a tightly focused femtosecond laser pulse in air

On the Stark Effect of the O I 777-nm Triplet in Plasma and Laser Fields

“…Indeed, very pronounced sideband features of this line in laser-generated microplasmas were reported by Compton et al [11]. It should be noted that in [10], the calculations were approximate (readily acknowledged by the authors) due to a rather complex interplay between the plasma electron impacts, laser fields, and the spin-orbit atomic interaction, requiring a fairly advanced modeling for accurate treatment.…”

“…Recently, Ilyin et al [10] suggested that the significantly larger broadening observed in [5] might, in fact, be caused by the laser field (after the main pulse) that happened to be nearly resonant with the transition investigated. Indeed, very pronounced sideband features of this line in laser-generated microplasmas were reported by Compton et al [11].…”

Simulation analysis of the HPM propagation along the femtosecond laser plasma double-line

“…In recent years, the femtosecond laser technology has attracted great interests of researchers all over the world in 1 the past two decades [1][2][3][4][5] . The high power femtosecond laser can produce plasma filaments in the atmosphere under the dynamic balance between diffraction, dispersion, Kerr nonlinearity and multiple photons ionization, which has been widely used in different applications, such as generating terahertz (THz) radiation [6] , broadening the laser emission spectrum [7] , long-range detection, laser remote sensing, and guiding the forceful lightnings in rainstorm [8] . Furthermore, the plasma filaments can also provide efficient transport of the HPM energy with high power density in air over several tens of meters [9] , even reaching a kilometer [10] , which has been demonstrated and published in some experimental and theoretical studies [11][12] .…”

Guiding performance of 6 GHz electromagnetic wave by single laser plasma filament

“…Based on these special properties, plasma filaments have potential applications in many fields, e.g. acting as a THz radiation source [10], improving the aerodynamics of fast-moving objects [11], widening the laser emission spectrum [12], and guiding lightning in rainstorms [13]. Channeling of electromagnetic (EM) energy by a single plasma filament has also been carried out by many exper imental and theoretical studies [14,15].…”