采用皮秒泵浦-探测方法研究了碲镉汞材料中非平衡载流子动力学过程，发现其差分透射强度在经过饱和之后出现一个负的极小值，归结为深能级的再吸收过程.采用速率方程模型，并引入两个深能级弛豫时间常数，很好地拟合了差分透射强度的延时曲线.两个深能级弛豫时间常数的存在意味着同时存在两种不同类型的深能级，揭示了碲镉汞材料中深能级特性的复杂性.此外还研究了弛豫时间随泵浦脉冲能量的变化关系.

The non-equilibrium carrier dynamics in HgCdTe has been studied with picosecond pump-probe measurements. The delay-time dependent differential transmission shows a negative minimum after the absorption saturation maximum, which can be attributed to an additional absorption process because of the deep levels. A rate equation formalism has been employed to model the carrier dynamics. The experimental differential transmission spectrum has been fitted very well with the calculations when two deep level relaxation time constants are introduced, implying two types of the deep levels. The variation of the relaxation time with the pump intensity has also been studied.