ELECTRON-SPIN-RESONANCE STUDY OF ND3+ AND ER3+ IONS IN YALO3

In this paper me present tile results of ESR and photo-ESR measurement s on YAlO3(YAP) single crystals and powder samples doped purposely wit h about 1 at.% Nd3+ and undoped crystals in which Er3+,, observed as r esidual dopant. Tile ESR measurements were carried out at X-band spect rometer in 4-300 It temperature range. Tile photo-ESR was performed at 5 It using a mercury are lamp. For tile Nd3+ doped crystals the inten sity of ESR signal decreased about 3 times during illumination conditi ons. Moreover, tile calculations of the g tensor and A hyperfine struc ture parameters for Nd3+ and Er3+ were carried out.