Laser Pulse-Probe Techniques for Investigating Physical Processes of Ions in Solids

该研究项目利用激光光谱技术， 研究无机基质中基本物理过程 掺杂有过渡金属和稀土离子的晶体。 的 要研究的过程包括离子之间的能量迁移， 无辐射弛豫跃迁。 的实验技术 包括四波混频，累积光子回波， 和脉冲探针瞬态吸收实验。 将努力 为了验证四波起源的详细模型， 固体中离子的混合信号，除了表征 在固体中这些离子之间的能量迁移。 测量 将在亚皮秒范围内进行真实的时间测量。 还将采用单轴应力测量。 是希望 了解更多关于与以下方面相关的知之甚少的过程 离子激发态之间的无辐射弛豫， 固体

This research project utilizes laser spectroscopy techniques to investigate fundamental physical processes in inorganic host crystals doped with transition metal and rare earth ions. The processes to be studied include energy migration among the ions and radiationless relaxation transitions. The experimental techniques to be employed include four-wave mixing, accumulated photon echos, and pulse-probe transient absorption experiments. An effort will be made to verify a detailed model for the origin of the four-wave mixing signal of ions in solids, in addition to characterizing the energy migration between these ions in solids. The measurements will feature real time measurements in the subpicosecond regime. Uniaxial stress measurements will also be employed. It is hoped to learn more about the poorly understood processes associated with radiationless relaxation among the excited states of the ions in solids.