We present results of investigation of transient and stable color centers g
enerated in YAlO3 and YAlO3, Nd crystals under the influence of gamma, cont
inuous wave and pulsed UV irradiation in the 30-300 K temperature range. In
fluence of the color centers on lasing characteristics of YAP-Nd crystals i
s also studied. The models of color centers in the examined crystals are di
scussed. (C) 1999 Published by Elsevier Science B.V. All rights reserved.