COMPUTATIONAL MODELING OF THE OPTICAL PUMPING OF SOLID-STATE LASERS AND THE HEATING OF THE ACTIVE ELEMENT WITH ALLOWANCE FOR WATER COOLINGA. V. Kondrashenko, V. M. Linnik, A. G. Sirotkina, and V. D. Urlin UDC 621.373.826 Two-dimensional nonstationary models of optical pumping of a solid-state laser in the presence of a reflector and heating of a cylindrical or plane active element with water cooling have been described. The results of calculations of the space-time dependence of the pumping rate and the temperature in the active element have been given for different versions of a neodymium laser with a crystalline active medium in laser-diode pumping. Institute of Laser-Physical Research, Russian Federal Nuclear Center-All-Russia Scientific-Research Institute of Experimental Physics, Sarov, Russia; email: firstname.lastname@example.org. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 76, No. 2, pp. 72-79, March-April, 2003. Original article submitted August 21, 2002.