Pressure dependence of the 4f~1 5d~1→4f~2 emission of Pr~(3+):YAG using excited state absorption

摘要

The pressure dependence of the emission of the 4f~15d~1 state of Pr~(3+) is reported. Excitation of the 4f~15d~1 state of Pr~(3+) is accomplished using excited state absorption from the ~3P_0 state to populate the 4f~15d~1 state of Pr~(3+) from which emission is measured as a function of pressure. The emission, which occurs at 320 nm at ambient pressure, is found to shift to lower energy, nearly linearly at a rate of -14.1 cm~(-1)/kbar. This compares with -12.5 cm~(-1)/kbar for Ce~(3+) in YAG. The pressure dependence of the 4f~15d~1 → 4f~2 transitions are explained using a standard crystal field approach and a configurational coordinate model to describe the effects of pressure on the electronic energy of the 4f~15d~1 state and the electron-lattice coupling.