Polarized absorption and dye-laser excited fluorescence spectra of Nd3+ in the Y3+ site of yttrium orthovanadate at 85 and 300°K are presented and analyzed. The absence of allowed transitions and the unusual concentration of line strength into one transition in π polarization within a given line group is shown by the Judd-Ofelt theory to be a consequence of the D2d symmetry of the site and ion placements in the unit cell which cause the A7±6 odd-parity crystal-field coefficient to be dominant. An energy level scheme giving level positions, level identities, and observed transitions is presented. The ground state was found to be Γ7(µ = ± 3/2) with a Jz, composition of ∓ 1/2, ± 7/2, and ∓ 9/2. Linewidths and peak cross sections of the [Equation] transitions are also presented. The principal laser line in this group at 10640.9 ± 0.2 Å was found to be predominately π polarized and to have a cross section of 30 × 10-19 cm2, which is 4.6 times larger than the laser transition of Nd3+ in YAG.
© 1976 Optical Society of America
Perry Pappas Yaney and L. G. DeShazer, "Spectroscopic studies and analysis of the laser states of Nd3+ in YVO4," J. Opt. Soc. Am. 66, 1405-1414 (1976)