INVESTIGATION OF MN IMPLANTED LINBO3 APPLYING ELECTRON-PARAMAGNETIC-RESONANCE

The effect of ion implantation on LiNbO3 crystal is studied using elec tron paramagnetic resonance spectroscopy (EPR). EPR measurements on th ese crystals were performed as a function of ion species Mn and Fe and fluence at room temperature, Also the effect of the laser illuminatio n on the EPR signal was determined by illuminating the crystal in situ and measuring the decay and growth of the EPR signal. LiNbO3:Mn2+ at a depth of approximately 200 nm was formed by implantation of 2.5 x 10 (14) and 1 x 10(17) Mn/cm(2) at 2 MeV. The implanted samples were comp ared with bulk doped crystals. It was found that the decay and growth of Mn EPR for the implanted crystal is very small compared with the bu lk doped LiNbO3:Mn crystal. This was found to be primarily due to the spin concentration on the crystals. On the other hand, the decay time of the high fluence is about 40% slower than the decay of the low flue nce implanted crystal. (C) 1998 Elsevier Science B.V. All rights reser ved.