用光子回波技术测量物质的横向弛豫时间

Measurement of the transverse relaxation time of material by photon echo techniques

本文采用密度矩阵法推导光子回波讯号强度与激光光脉冲相对延迟的一般关系,得出二脉冲、三脉冲光子回波强度随时延的变化公式。实验上,用可调谐染料激光器作为光源,分别采用二脉冲、三脉冲光子回波技术,测得室温常压下饱和碘蒸气的横向弛豫时间T_2约为140ps。

The relation between the intensity of photon echo signal and the optical delay time is derived by using the density matrix method. The application to two pulse and three pulse photon echo techniques is given. The transverse relaxation time of saturated iodine gas under regular temperature and pressure is measured experimentally by the two and three pulse photon ehco techniques, and the measurement result is about 140 ps.