介质极化的瞬时相位与振幅

Instantaneous transient phase and amplitude of polarization in dielectric

求解电子运动的二阶微分方程 ,在旋转波近似下 ,介质在外场突然变化时产生的瞬态感应极化与外场同频 ,但相位总是落后 ,最大落后为π 2 ;振幅大小与初态有关 ,随时间按指数规律衰减 ,衰减快慢由介质的阻尼系数决定 .

In homogenous broadened dielectric a transient polarization of induction(TPI)is created by ultra-short laser pulse.The frequency of the TPI is the same as that of the pump field and the delay of phase is π/2 at maximum the magnitude of amplitude of the TPI is in circumstance associate with the original state of the dielectric and the decay is exponential with time and associated with dephasing of the quantum coherent carrier.