强激光场作用下He原子低激发态的制备和控制

Control and Preparation of Low Excited States of He Atoms Interacted with Strong Laser Field

基于精确的角动量依赖的模型势,提出了利用激光脉冲驱动He原子产生布居数可控的基态与较低激发态的制备方案。通过数值求解三维含时薛定谔方程得到了相应的波长、峰值强度和脉宽激光参数。数值模拟结果表明,对于2s、2p、3p激发态,激光脉冲结束时的布居数均可达到100%。而对于3s和3d态,由于它们之间的能级差较小,且存在一定的电离几率,布居数最高仅到80%和86%。

A method for preparing the ground and low excited states with controllable populations of He atoms driven by a laser pulse is proposed based on an accurate angular-momentum-dependent model potential.The corresponding laser parameters of wavelength,peak intensity and pulse duration are obtained by the numerical solution of the three-dimensional time-dependent Schr9 dinger equation.The numerical simulation results show that for the 2 s,2 p and 3 p states,the populations at the end of laser pulse can all reach 100%,while for the states of 3 s and 3 d,the maximum populations are only 80%and 86%,respectively,because of their very close energy levels and small ionization probabilities.