Feynman’s Path Integral for Strong-Field Dynamics Method

The emergence and development of ultrafast intense lasers attosecond measurement techniques have made it possible to observe control the motion electrons on timescale attoseconds spatial scale atoms. As experimental measurements become increasingly precise, higher demands are placed accuracy theoretical calculation methods. Extracting temporal information dynamics from results using models presents a significant challenge. Compared exact solutions time-dependent Schrödinger equation, Feynman’s path integral method for strong-field calculations offers simpler model computational efficiency. electronic wave packet is regarded as particle with different initial states, by analyzing particle, causes various nonlinear physical phenomena in strong fields can be clarified. This paper introduces saddle point approximation field based theory. Furthermore, Coulomb-corrected approximation, trajectory-based Coulomb quantum trajectory methods presented detail. review aims provide relevant literature references research ideas new algorithms.