Pressure Tuning Studies of Yttrium Aluminum Garnet Based Solid State Laser Materials

本研究项目的主题是利用高压来改变掺杂-晶格和掺杂-掺杂相互作用，这些相互作用负责定义单独或组合掺杂Cr3+， Tm3+和Ho3+的YAG的光学性质。利用压力扰动YAG中Cr3+、Tm3+和Ho3+的局部键合环境，并进行实验监测压力对光学性质的影响。研究了压力对掺杂键合环境的影响，为YAG基固体激光材料的结构-性能相关性提供了理论依据。吸收、激发、连续波光致发光和时间分辨光致发光实验将作为压力的函数进行。压力对能级和分裂、光跃迁强度、发光寿命和效率以及离子-离子能量转移过程的影响将被表征。研究的过程包括Cr3+-Tm3+、Cr3+-Ho3+、Tm3+-Ho3+能量转移、Tm3+-Tm3+能量迁移和交叉弛豫、Ho3+上转换。这项研究旨在提高对固态激光材料的基本认识。这些材料在医学、光纤通信、太阳能和成像领域的应用非常重要。高压将被用来改变材料结构，光学性质的变化作为压力的函数将被实验研究。该研究有望为理解石榴石基材料的化学成分和结构与激光性能的关系提供所需的分子信息。＊＊＊

9307849 Bray The theme of this research project is the use of high pressure to alter the dopant-lattice and dopant-dopant interactions responsible for defining optical properties of YAG doped with Cr3+, Tm3+, and Ho3+, separately and in combination. Pressure will be used to perturb the local bonding environments of Cr3+, Tm3+, and Ho3+ in YAG, and experiments will be conducted to monitor the effects of pressure on optical properties. The effect of pressure on the dopant bonding environment will be characterized so that structure-property correlations for YAG based solid state laser materials can be developed. Absorption, excitation, cw photoluminescence, and time-resolved photoluminescence experiments will be performed as a function of pressure. The effect of pressure on energy levels and splittings, optical transition intensities, luminescence lifetimes and efficiencies, and ion-ion energy transfer processes will be characterized. Processes to be studied include Cr3+-Tm3+, Cr3+-Ho3+, and Tm3+-Ho3+ energy transfer, Tm3+-Tm3+ energy migration and cross-relaxation, and Ho3+ upconversion. %%% This research aims to improve fundamental understanding of solid state laser materials. These materials are important in applications in the areas of medicine, optical fiber communications, solar energy, and imaging. High pressure will be used to modify material structure, and changes in optical properties as a function of pressure will be studied experimentally. The research is expected to provide the molecular information needed to understand the relationship of chemical composition and structure to the laser properties of garnet based materials. ***