Abstract
The optical properties of SrWO4 crystals doped with Nd3+ have been investigated at temperatures ranging from 10 to 300 K. The scheme of the energy levels up to20 000 cm−1 has been deduced from low temperature measurements and reproduced bytheoretical calculations based on a parametric Hamiltonian including Coulombic,spin–orbit and crystal field terms. The spontaneous transition probabilities, thebranching ratios and the radiative lifetime have been calculated in the frameworkof the Judd–Ofelt theory and compared with the experimental results for the4F3/2 emitting level. The optical bands are broadened because of crystal field inhomogeneitiescaused by charge compensation processes accompanying the substitution ofNd3+ for Sr2+. This fact and the high emission cross section values obtained for the emission from the4F3/2 multipletindicate Nd:SrWO4 as a possible active medium for tunable laser operation.
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