Optical Dephasing of Ions in Solids and Studies of Phonon Dynamics

这项研究的目的是获得新的信息， 使用强大的远红外高频声子动力学 声子产生技术与灵敏和可调谐的 光学检测方法 第二个项目涉及研究 的光学退相和光谱扩散，使用各种 技术探测广泛的时间尺度。 远红外 缺陷诱导的单声子吸收允许产生 可调单能声子分布，当与 采用振动电子边带声子光谱学的可调谐检测， 将允许真正的时间分辨声子光谱学。 这 光谱学将用于研究非谐声子-声子 相互作用负责声子分裂和声子 重组 光学退相研究将利用方法 在时域和频域中。 特别值得注意的是 不同时间尺度对确定 均匀线宽 将对这些结果进行分析， 由于电子自旋-自旋引起的退相的随机模型， 电子-核自旋相互作用 计算机模拟也将 发展。

This research has the purpose of obtaining new information on the dynamics of high frequency phonons using powerful far infrared phonon generation techniques coupled with sensitive and tunable optical detection methods. A second project involves the study of optical dephasing and spectral diffusion using a variety of techniques probing a wide range of time scales. Far infrared defect-induced one-phonon absorption permits generation of a tunable monoenergetic phonon distribution, which when combined with tunable detection employing vibronic sideband phonon spectroscopy, will permit truly time-resolved phonon spectroscopy. This spectroscopy will be used to study anharmonic phonon-phonon interactions responsible for phonon breakup and phonon recombination. The optical dephasing studies will utilize methods in both the time and frequency domain. Of special interest are the effects of different time scales for the determination of homogeneous line width. These results will be analyzed with stochastic models for the dephasing due to electron spin-spin and electron-nuclear spin interactions. Computer simulations will also be developed.