Transient colour centre in YAG : Nd

Formation of a transient absorption centre is demonstrated in YAG : Nd monocrystals on intensive irradiation in the near UV spectrum region. Spectral distribution has been studied of their absorption coefficient, their decay kinetics was also followed. Activation energy of the decay process was determined from the temperature dependence. The transient absorption centre possessing the character of V-centres exsrcise, in view of the spectral course of their absorption coefficient, a certain amount of influence upon the efficiency of the YAG : Nd laser.