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Linewidths and Thermal Shifts of Spectral Lines in Neodymium-Doped Yttrium Aluminum Garnet and Calcium Fluorophosphate

Measurements in the 4.2-500°K temperature range are reported of the widths, shapes, and thermal shifts of the 1.06- and 0.9-μ lines of the Nd 3 + ions in yttrium aluminum garnet (YAlG) and calcium fluorophosphate. The results are interpreted in terms of phonon-impurity interactions and static crystal strains. The obtained effective Debye temperature of YAlG is compared with the phonon density spectrum deduced from vibronic sidebands of the R lines in YAlG: Cr 3 + . The R → Z 5 and R → Y 6 transitions of YAlG: Nd are observed to shift exceptionally to the higher energies with an increase of temperature. This is tentatively ascribed to the pushing effect of nearby higher-lying manifolds. Comparison of widths of several lines in YAlG: Nd at low temperatures reveals that the fluctuation of the second-degree crystal-field parameters contributes to the inhomogeneous linebroadenings. Discussions are also presented on the suitability of hard crystals with high phonon cutoff frequencies for the laser host materials. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review American Physical Society (APS)

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