| Abstract: | The photorefraction in LiNbO3 single crystals dependent on the melt composition with and without MgO doping was investigated. It was found that 1 mol% MgO-doped crystal with nearly stoichiometric composition has a strong photorefraction resistance. compared with a congruent composition. In an undoped crystal, the photorefraction was shown to be pronounced as incrcasing Li content of a melt from 48.6 to 58 mol% Li2O. These results were discussed from a viewpoint of the relationship between the photoconductivity and the concentration of cation-site vacancies or Nb on Li-site. |
