Current conception of attosecond pulse is based on Fourier optics and refers to an electromagnetic pulse with a broad. homogeneous weight Fourier spectrum. Its preparation/generation is along an indirect route in which the output of commercial available μ m-level wavelength laser is “processed„ by elaborately designed optics medium allowing high-order harmonics effect... https://www.jmannino.com/great-choice-Disney-Princess-Cinderella-Curtsy-Art-Galaxy-S10-Clear-Case-p29207-mega-find/