Excited State Absorption of Cr3+ in Low Ligand Field Hosts
Excited state absorption (ESA) can exert a major influence in determining the usefulness of a fluorescent material for laser applications. For the specific case of Cr3+, a single configurational coordinate model is developed to predict the ESA consequences of a 4T2g (low ligand field) or (high ligand field) lowest excited state. Pulse-probe ESA measurements are conducted for Cr3+ in a fluoride elpasolite (K2NaScF6) and in two oxide garnets (GSGG and GSAG) to test the predictions for the low field case. In accordance with the model, two ligand field transitions are located at 7,000 and 19,100 cm-l in the garnets, and an intense charge transfer band is absent in the fluoride and ligand field transition is located near 19,500 cm-l. Saturation experiments are used to determine the ESA cross-sections. A comparison is made with the published ESA spectrum of emerald:Cr3+ (high ligand field) to illustrate the substantial difference between absorption from 2E and 4T2 initial states.
KeywordsPump Intensity Ligand Field Excited State Absorption Lower Excited State Lawrence Livermore Laboratory
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