Abstract: Ti and Fe co-doped LiNbO₃ crystals were grown from the melt by Czochralski method. The influence of different doping concentration on photorefractive
effect was studied, the optical transmission spectra before and after reduction treatment were measured too. It was confirmed by ESR method that Ti
ion exists in untreated Ti: Fe: LiNbO₃ crystals in the form of Ti⁴⁺. It was supposed that the Fe²⁺ concentrations increase in untreated Ti: Fe:
LiNbO₃ crystal due to charge compensation effect. Without reduction treatment, the concentration of Fe²⁺ in crystals can be controlled by Ti dopping.The diffraction efficiency , which can be high up to over 90.00%, was also
measured by using two-wave coupling technique. Ti: Fe: LiNbO₃ crystal is a good new photorefractive material.

Key words: Ti: Fe: LiNbO₃ crystal, crystal pulling, transmission spectrum, diffraction efficiency, photorefraction