The Study Of Coherent Dynamics Of Strong Laser Field And Atomic System

The interaction of optical field with matter is always one of the most important researches in optical and physics.Some features of matter in strong fields have been explored with the development of laser,and it's also the beginning of the strong field physics.Some new physics features shown by strong field ionization or shown by quantum coherent control,have been researched widely.There are two parts in this thesis,the first one is about the quantum coherent control with Doppler effect,we studied the features of the optical waveguide induced by Active Raman gain(ARG)in four-level N-type atomic system at room temperature.The second one is about the atomic ionization in elliptical polarization laser field.In this part,we studied the photoelectrons momentum distribution in elliptical polarization laser field by using classical trajectory Monte Carlo method(CTMC).The main achievement and important result are as follows:The Hamiltonian and density matrix element of the interaction of optical field with matter in four-level N-type atomic system has been studied by using semiclassical theory.And we used it to investigate the complex susceptibility.By introducing the Doppler effect,we found that in this system the Doppler effect would not attenuate the waveguide structure,on the contrary,it will enhance the dispersion.Then we got the propagation dynamics in this waveguide at different temperature.We simulated the progress of ionization by using CTMC and got the picture of photoelectrons momentum distribution in one-color elliptical polarization laser field with coulomb potential.Then we also studied the photoelectrons momentum distribution in two-color elliptical polarization laser field with coulomb potential preliminarily.