A new concept is introduced whereby thermal stresses generated through the
pumping process are canceled by an applied force. By use of a Nd:YVO4 disk
laser as a model system, significant reduction of thermal lensing and defor
mation is demonstrated as a function of applied pressure, and the output po
wer (19 W TEM00) is limited only by the available pump power. (C) 1999 Opti
cal Society of America.