光脉冲在Λ-三能级介质中传输的解析分析

Propagation of laser pulse in a three-level Λ-type medium

通过选取几种特殊的光场形式,简化了光场在Λ-三能级介质中的传输方程,得到了非线性传输方程明确的解析表达式,解析地分析了光场时空演化的物理机理.结果表明,激光脉冲的形状可以由传播方程的群速度或边界条件控制.

By choosing special temporal profiles of laser pulses,propagation equations which govern the propagation of them in a three-level Λ-type medium is simplified.Some explicit expressions of analytical solutions to the propagation equations are obtained.The physical mechanism of spatial and temporal evolution of the two laser pulses is analyzed analytically.It is shown that the shape of a laser pulse can be manipulated by group velocities or boundary conditions of the propagation equations.