An EPR study of Er3+ impurities in RbTiOPO4 single crystals

摘要

An electron paramagnetic resonance (EPR) study of Er3+ ions in single crystals of RbTiOPO4 (RTP) is presented. The EPR spectra show the existence of six different Er3+ centres. The g-matrix has been determined for these centres from the analysis of the angular dependences of the spectrum in three planes of the crystal. The study supports that erbium can enter the Rb+ and Ti4+ low-symmetry sites of RTP. This conclusion differs from those for KTP:Er3+ and RTP codoped with Nb and Er. The different occupancies found for Er in these various crystals is suggested to be due to the differences in Er concentration.