Optical Transitions, Energy Transfer and Laser Operation of Electronic and Molecular Defects in Ionic Crystals

对振动和电子跃迁的扩展研究， 简单和复杂的弛豫和能量传递过程 碱金属卤化物中的缺陷。孤立的分子缺陷， 用各种IR激光或电子激发激发 技术，将探讨在频谱和时间域 对于红外振动荧光，存在于弱或强 竞争多声子或多声子弛豫， 分子间振动能量转移过程。 分子缺陷与F中心的缔合形成对- 在F-电子激发下可以产生 有效的电子振动（E-V）能量转移到 导致多步振动发射的分子模式。 在基质材料的变化下， 技术的动力学和物理机制的E-V 将研究和澄清转移过程。 的能力 这些缺陷对产生振动超荧光， 可见光泵浦振动固体激光器将是 系统地探索和发展。 除了这些 振动发射系统，强烈的电子跃迁 新的F-聚集中心将被研究，目的是 开发具有改进的稳定性CW的色心激光器 在扩展的近红外调谐上的As皮秒锁模操作 范围 这些激光器的单模操作将用于 各种振动条件下高分辨率烧孔实验 电子缺陷。 他们对秩序/无序的积极工作 纯的和混合的碱金属-氰化物的转变将被延长， 特别是新的光学问题和技术。

An extended study of vibrational and electronic transitions, relaxation and energy-transfer processes of simple and complex defects in alkali halides is planned. Isolated molecular defects, excited with various ir laser or electronic excitation techniques, will be explored in the spectral and temporal domains for ir vibrational fluorescence, existing in weak or strong competition to multi-phonon or multi-roton relaxation or intermolecular vibrational energy transfer processes. Association of molecular defects with F centers form pair- configurations, which under F-electron excitation can produce efficient electron-vibration (E-V) energy transfer into the molecular modes leading to multi-step vibrational emission. Under variation of host materials, molecules and optical techniques the kinetics and physical mechanism of the E-V transfer process will be studied and clarified. The ability of these defect-pairs to produce vibrational superfluorescence and visible-light-pumped vibrational solid state lasers will be systematically explored and developed. Besides these vibrationally emitting systems, strong electronic transitions of new F-aggregate centers will be studied with the aim of developing color center lasers with improved-stability cw as well as psec mode-locked operation over an extended near ir tuning range. Single mode operation of these lasers will be used for high-resolution hole-burning experiments in various vibrational and electronic defects. Their active work on order/disorder transitions of pure and mixed alkali-cyanides will be extended, particularly towards new optical questions and techniques.