Theoretically Demonstrate Obtaining The Pulse Of Attosecond By Mixing Two-color Field

The generation of ultrashort pulses is a key to explore the dynamic behaviour of matter on ever-shorter timescales. Recent developments have pushed the duration of laser pulses close to its natural limit, which lasts somewhat longer than one femtosecond (1fs=10-15s) in the visible spectral range. Time-resolved measurements with these pulses are able to trace dynamics of molecular structure, but fail to capture electronic processes occurring on an attosecond (las=10-18s) timescale.Since then, measurement and control of the subcycle field evolution of few-cycle light have opened the door to a radically new approach to exploring and controlling processes of the microcosm.The hyperfast-varying electric field of visible light permitted manipulation and tracking of the atomic-scale motion of electrons.Steering and tracing electronic motion in atoms, molecules, and nanostructures are now becoming available.We theoretically demonstrate that the laser-parameter effects on the generation of the attosecond by mixing two-color laser field, visible light field of800nm and a mid-infrared (mid-IR) laser pulses of2400nm. Different schemes is applied to discuss the function of the intensity, carrier-envelope phase(CEP) and pulse duration on the generation of an isolated attosecond in this paper. As a consequence, an isolated16as pulse is obtained by Fourier transforming an ultrabroad XUV continuum of208eV with the fundamental field of duration of6fs,9×1014W/cm2of intensity, the duration of duration of12fs, the CEPs of the two driving pulses of-π and the relative strength ratio R=0.2. And then we mix a visble light field of800nm with a a terahertz (THz) field of3μm with the duration of12fs,2.4×1014W/cm2of intensity getting a continuum of260eV and a12as pulse is directly generated.