Three-dimensional non-adiabatic model for high-order harmonic generation with few-optical-cycle pulses

Summary form only given. High-order harmonic generation (HHG) is a rapidly developing topic in the field of laser-atom interaction and a promising tool for the generation of coherent XUV radiation. Recently, a number of studies have shown the advantage of using few-optical-cycle driver pulses for HHG. To understand the experimental results and study, under realistic conditions, topics such as transverse properties of the harmonics and effects of absolute carrier phase, a detailed model is required. We present a numerical model for the HHG with few-optical-cycle pulses, in a regime for which the adiabatic approximation is clearly not valid. The single-atom response is calculated using the non-adiabatic strong-field approximation and is inserted as a source term in a three-dimensional propagation code.