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The room-temperature cross sections for the Nd3+4F3/2levels to the4I11/2and4I9/2manifolds (lower laser state and ground state, respectively) in NdP5O14are measured by two spectroscopic methods. A value for the largest cross section ofσ(R₁ - Y₂) = 1.7 × 10⁻¹⁹cm2is found. The highest effective cross section, resulting from superposition of two lines at 1.051 μm, gives a laser gain per Nd ion which is about 2/3 of the maximum gain in YAG:Nd. The relative branching ratio into the4I11/2and4I9/2manifolds is 0.65:0.35. Comparison of the integrated cross sections with the measured lifetime for 1-percent Nd in LaP5O14indicates a combined efficiency4I13/2and4I15/2manifolds and multiphonon quenching. A measurement of temperature dependence of fluorescence lifetime supports this last result.
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Weber et al. (1974) studied this question.
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