Terahertz （THz） wave emission from argon atom in a two-color laser pulses is studied numerically by solving the one-dimensional （1D） time-dependent Schr6dinger equation. The THz spectra we obtained include both di...Terahertz （THz） wave emission from argon atom in a two-color laser pulses is studied numerically by solving the one-dimensional （1D） time-dependent Schr6dinger equation. The THz spectra we obtained include both discontinuous and continuum ones. By using the special basis functions that we previously proposed, our analysis points out that the discontinuous and continuum parts are contributed by bound-bound and continuum-continuum transition of atomic energy levels. Although the atomic wave function is strongly dressed during the interaction with laser fields, our identification for the discontinuous part of the THz wave shows that the transition between highly excited bound states can still be well described by the field-free basis function in the tunneling ionization regime.展开更多
基金The project is supported by K. C. Wong Education Foundation(Hongkong)in part by the President Fund of GUCASState Key Development Program for Basic Research of China(973)(2007CB310401)
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11465016,11374366,and 11164025)
文摘Terahertz （THz） wave emission from argon atom in a two-color laser pulses is studied numerically by solving the one-dimensional （1D） time-dependent Schr6dinger equation. The THz spectra we obtained include both discontinuous and continuum ones. By using the special basis functions that we previously proposed, our analysis points out that the discontinuous and continuum parts are contributed by bound-bound and continuum-continuum transition of atomic energy levels. Although the atomic wave function is strongly dressed during the interaction with laser fields, our identification for the discontinuous part of the THz wave shows that the transition between highly excited bound states can still be well described by the field-free basis function in the tunneling ionization regime.
