This paper discusses the temperature dependence of the radiation energy and the lasing threshold of lasers based on a potassium-gadolinium tungstate crystal doped with Nd31 ions. The values of the universal parameters needed to carry out the calculations have been measured in terms of a technique proposed for determining how the gains and the cross section vary with increasing temperature in a four-level active medium.
V. A. Alekseeva, A. V. Lukin, and S. I. Khankov, "Temperature dependence of the energy parameters of a KGW:Nd3+ laser that lases at 1.06 and 1.35 um," J. Opt. Technol. 70, 95-100 (2003)