An investigation on photodamage of Zn:In:LiNbO3 crystal wave-guide substrate

In this research, Czochralski method was used to grow Zn:In:LiNbO3 crystal. The lattice constants, ultra-visible absorption spectra, infrared absorption spectra and photodamage resistance ability of the crystal were measured. The photodamage threshold of LiNbO3 and Zn:In:LiNbO3 crystal wave-guide substrate were investigated by the m-line method. It is found that the higher the concentrations of In and Zn were doped, the more the absorption band of crystal was shifted to short wave. The OH- absorption peak of Zn(3mol%):In(2mol%):LiNbO3 and Zn(3mol%):In(1mol%):LiNbO3 crystal was located at about 3484cm(-1), and that of Zn(3mol%):In(3mol%): LiNbO3 crystal was located at about 3515cm(-1). The photodamage resistance ability of Zn(3mol%):In(2mol%): LiNbO3 crystal was two orders of magnitude higher than that of LiNbO3 crystal. The photodamage threshold of LiNbO3 crystal wave-guide substrate and Zn:In:LiNbO3 crystal wave-guide substrate were 5 X 10(3)J/cm(2) and I X 10(6)J/cm(2), respectively.