Creation and Optimization of Single Attosecond XUV Pulse by Multicolor Laser Pulses

Extreme nonlinear optics happens when we turn up the focused laser power and electrons are literally ripped away from atoms by the laser field. An electron is stripped from an atom, gains energy, and releases this energy as a soft x-ray photon, this accumulated energy as a high-energy photon when it recombines with an ion. In the last ten years, scientists pay close attention to produce laser pulse in shorter length to observe the motion of electrons in atom and molecules. In this thesis, we present a simple and convenient method to generate an isolated attosecond pulse via HHG power spectra of hydrogen atom driven by three-color laser field. This special electric field is composed of three special ratio frequency (ω, ω/2 , 2ω/3 ) with the same laser intensity. The field can be used to produce a single attosecond XUV pulse with strong intensity