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Spectroscopic studies and analysis of the laser states of Nd3+ in YVO4

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Abstract

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 A±67 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 4F3/24I11/2 transitions are also presented. The principal laser line in this group at 10 640.9 ± 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

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