OPTICAL-ABSORPTION AND FLUORESCENCE INTENSITIES OF ND-3+ IN THE GARNETS CAY2MG2GE3O12 AND GD3GA5O12 AND THE BIAXIAL CRYSTAL LA2BE2O5

The Judd-Ofelt (JO) theory was applied to interpret the optical-absorption intensities of trivalent neodymium (Nd3+) in the garnets CaY2Mg2Ge3O12 and Gd3Ga5O12 and the biaxial crystal La2Be2O5 yielding the JO parameters 2, 4, and 6. The JO theory applied to the F324 fluorescence transition in Nd3+ predicts a linear relation between the ratio R of the 1.06- to 1.35-m fluorescence band intensities and the ratio 46 of JO intensity parameters. This linearity was verified by independent measurements of R and 46 for a series of Nd3+-doped crystals and was found to be dependent on the type of free-ion wave functions that were used in calculating the required transition-matrix elements. © 1979 The American Physical Society.