Na_(2)O-doped(up to 3mol%Na in the melt)LiNbO_(3) crystals have been grown by the Czochraski method.The experimental results show that Na_(2)O dopants can increase the ability of LiNbO_(3) to resist light-induced opti...Na_(2)O-doped(up to 3mol%Na in the melt)LiNbO_(3) crystals have been grown by the Czochraski method.The experimental results show that Na_(2)O dopants can increase the ability of LiNbO_(3) to resist light-induced optical damage,but the photorefraction of LiNbO_(3):Na(3 mol%)is larger than that of LiNbO_(3):Na(1 mol%)and the absorption edge of the former crystal has a longer wavelength compared with that of the latter.These two abnormal phenomena were interpreted as that some ilmenite structure(NaNbO_(3))regions are formed in doped LiNbO_(3) crystals with the increasing dopant concentration of Na_(2)O.展开更多
The ability of Li-rich LiNbO3:Mg(5mol%):Fe(0.lwt%)to resist photorefraction is found to be comparable to that of LiNbO3:Mg(5mol%),even though the photorefraction sensitive dopant Fe is added.The nuclear quadrupole spl...The ability of Li-rich LiNbO3:Mg(5mol%):Fe(0.lwt%)to resist photorefraction is found to be comparable to that of LiNbO3:Mg(5mol%),even though the photorefraction sensitive dopant Fe is added.The nuclear quadrupole splitting and isomer shift of 57Fe in Li-rich LiNbO3:Mg57Fe and LiNbO3:57Fe are quite different.The electron spin resonance spectra of the two kinds of crystals are significantly different,too.The enhanced resistance to photorefraction may be due to the change in occupation sites of Fe ions.展开更多
文摘Na_(2)O-doped(up to 3mol%Na in the melt)LiNbO_(3) crystals have been grown by the Czochraski method.The experimental results show that Na_(2)O dopants can increase the ability of LiNbO_(3) to resist light-induced optical damage,but the photorefraction of LiNbO_(3):Na(3 mol%)is larger than that of LiNbO_(3):Na(1 mol%)and the absorption edge of the former crystal has a longer wavelength compared with that of the latter.These two abnormal phenomena were interpreted as that some ilmenite structure(NaNbO_(3))regions are formed in doped LiNbO_(3) crystals with the increasing dopant concentration of Na_(2)O.
基金Project supported by the National Natural Science Fund of China.
文摘The ability of Li-rich LiNbO3:Mg(5mol%):Fe(0.lwt%)to resist photorefraction is found to be comparable to that of LiNbO3:Mg(5mol%),even though the photorefraction sensitive dopant Fe is added.The nuclear quadrupole splitting and isomer shift of 57Fe in Li-rich LiNbO3:Mg57Fe and LiNbO3:57Fe are quite different.The electron spin resonance spectra of the two kinds of crystals are significantly different,too.The enhanced resistance to photorefraction may be due to the change in occupation sites of Fe ions.
