YAlO₃ (YAP) single crystals doped with praseodymium ions are of interest as perspective materials for solid-state lasers.
In the present work we show results of investigation of both transient and stable optical absorption induced in YAP:Pr crystals by ionizing radiation. The transient changes of absorption and relaxation kinetics were measured after excitation of the crystals with the pulsed electron beam (E~0.25 MeV, pulse duration - 10 ns) at room temperature. The stable changes of absorption were measured after gamma-irradiation of the crystals up to 10⁶ Gy absorbed dose and high temperature treatments in reducing and oxidizing atmosphere.
The gamma-irradiation of YAP:Pr leads to the crystal coloration (absorption maxima near 40000, 33000, 25000 and 20000 cm^-1 ) caused by recharging of intrinsic point defects of the host.
The transient changes of absorption measured just after electron beam pulse reveal the absorption maxima near 25000, 20000 and 13000 cm^-1. The centers responsible for the absorption bands at 25000 cm-1 and 20000 cm^-1 decay after electron beam pulse, while part of them remain as stable ones. The centers responsible for the band near 13000 cm^-1 are unstable at room temperature.
The results obtained for YAP:Pr crystals are compared with the corresponding ones for pure YAP and YAP:Ca,Pr crystals as well as results obtained previously for YAP:Nd crystals (see [1]). The origin of color centers induced in the crystals is disscussed.
[1] D. Sugak et al., Phys. Stat. Sol. (a) 184 (2001) 239.

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