The effect of temperature on the spectral-luminescence characteristics of laser neodymium glasses

Data are presented on the effect of temperature in the 77-700 K range on the spectral-luminescence characteristics of the laser neodymium glasses GLS-2 (silicate) and GLS-22 (phosphate). It is found that, with increasing temperature, the absorption and luminescence bands are broadened and shifted toward the long-wave region, while the peak intensities decrease. The Judd parameters, oscillator strength, radiative transition probabilities, and stimulated emission cross sections are reduced by no more than 25%. The luminescence quantum yield, q(3/2-11/2), is reduced by approximately 40% during heating from 300 to 700 K.