Laser Spectroscopy Investigations of Dynamical Processes of Ions in Solids

本研究的目的是表征 激光泵浦掺旋光离子晶体 激发 研究可分为两个主要领域： 表征长距离能量迁移的性质 在掺杂离子和确定无辐射率 激发态之间的跃迁。 主要 本工作中使用的实验技术是四波 混合（FWM）光谱。 对于能量转移研究， 将通过时间分辨位点选择（TRSS）进行补充 光谱测量，以及无辐射衰变 这项研究将由皮秒脉冲探测器补充 测量和累积光子回波测量。 的 实验将在几种掺铬晶体上进行 这对激光应用很重要。 通过关联 在这两个领域获得的信息，将有可能 开始发展对光谱的详细了解 光泵浦激光材料的动力学。 通过比较 在每种研究材料上获得的结果， 可以将这些特性与 宿主水晶 从这种类型中获得的知识 详细、系统的研究对持续的 激光和电光技术的发展。

The goal of this research is to characterize the properties of crystals doped with optically active ions and pumped by laser excitation. The research can be divided into two thrust areas: characterizing the properties of long range energy migration among the doping ions and determining the rates of radiationless transitions between excited electronic states. The major experimental technique to be used in this work is four-wave mixing (FWM) spectroscopy. For the energy transfer studies this will be supplemented by time-resolved site-selection (TRSS) spectroscopy measurements, and for the radiationless decay studies this will be supplemented by picosecond pulse-probe measurements and by accumulated photon-echo measurements. The experiments will be performed on several chromium doped crystals that are important for laser applications. By correlating the information obtained in both of these areas, it will be possible to begin developing a detailed understanding of the spectral dynamics of optically pumped laser materials. By comparing the results obtained on each of the materials investigated, it will be possible to relate these characteristics to the properties of the host crystal. The knowledge gained from this type of detailed, systematic study is important to the continued development of laser and electro-optic technology.