Simulation of Self-Focusing of Femtosecond Laser Pulses in Air by the Method of Diffraction-Beam Tubes

Dynamics of femtosecond synthesized coronary profile laser beam filamentation in air

“…To this end, we use the concept of diffraction-optical rays and associated diffraction-ray tubes (DRT). The mathematical fundamentals of the diffraction-rays methodology for optical beam propagation is presented in detail, e.g., in [32][33][34]. This approach helps to visualize a diversity of physical peculiarities accompanying the interaction of high-intensive optical radiation with a nonlinear medium.…”

Model of the effective permittivity during intensity collapse stopping for propagation of high-power femtosecond laser pulses

“…The phase characteristics of radiation during the propagation of a high-power femtosecond laser pulse in air will be analyzed. Let us consider the diffraction-ray pattern constructed in [9] for a titanium-sapphire laser pulse (wavelength λ = 800 nm) with a duration tp = 100 fs at an initial beam radius R0 = 1 mm and a peak power P0 that is 6 times higher than the critical self-focusing power Pcr = 3.2 GW (Fig. 1).…”

“…1). The dependence of the radii of diffraction-ray tubes (DRTs) from [9] was supplemented by the dependence of the intensity (green curve) along the path, as well as dashed lines denoting the coordinates of the points zc and zf. These coordinates were determined based on the calculation of derivatives ( 6) and ( 8).…”