Measurements of absorption and excitation spectra for Nd3+ in soda-lime silicate glass, CaWO4, and Y3Al2(AlO4)3 (YAG) are presented. The relative quantum efficiency for fluorescence is evaluated for principal absorptions over the wavelength range 3250–9300 Å. For the crystals, quantum efficiency is found to be independent of the level pumped, to within ±12% for CaWO4 and ±13% for YAG. Except for slight quenching of levels between 4000 and 5500 Å, quantum efficiency for the glass sample is independent of pumping level to within ±5%. These results indicate that the efficiency of each step in the process which populates the level is near unity. Also, over the range of structures investigated, relative Nd3+ quantum efficiency appears to be independent of the details of crystal-field structure.
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