The accurate refractive indices in visible range and their Sellmeier equations have been obtained for a series of LiNbO_(3):Mg(5mol%)crystals with Ti or Nd doping.The phase matching angle for 1.064μm calculated by Se...The accurate refractive indices in visible range and their Sellmeier equations have been obtained for a series of LiNbO_(3):Mg(5mol%)crystals with Ti or Nd doping.The phase matching angle for 1.064μm calculated by Sellmeier equation gives good agreement with experimental value.The TiO_(2) and Nd2O_(3) doping cause the decrease of the birefringence and the increase of the phase matching angle.The conversion efficiency is enhanced by TiO_(2) doping.The second harmonic generator with conversion efficiency of more than 44%has been achieved at room temperature with phase matching angle close to 90°.展开更多
The influence of Nd:MgO:LiNbO_(3) composition on the optical quality and resistance to photorefraction has been studied.Nd:MgO:LiNbO3(1molNd_(2)O_(3),7.5mol%MgO)crystal has been found to have enhanced resitance to pho...The influence of Nd:MgO:LiNbO_(3) composition on the optical quality and resistance to photorefraction has been studied.Nd:MgO:LiNbO3(1molNd_(2)O_(3),7.5mol%MgO)crystal has been found to have enhanced resitance to photorc-fraction,lower phase matching temperature and good optical quality.This crystal is promising material for self-frequency-doubled and self-Q-switched laser devices.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
The transformation horn stage-2 to stage-1 in HC1O_(4)-graphite intercalation compounds is studied by in-situ Raman scattering.The results show the coexistence of well-ordered regions of both stages during the stage t...The transformation horn stage-2 to stage-1 in HC1O_(4)-graphite intercalation compounds is studied by in-situ Raman scattering.The results show the coexistence of well-ordered regions of both stages during the stage transition.The resonant enhancement of Raman scattering has been found in stage1 and stage-2 HC1O_(4)-GICs.展开更多
文摘The accurate refractive indices in visible range and their Sellmeier equations have been obtained for a series of LiNbO_(3):Mg(5mol%)crystals with Ti or Nd doping.The phase matching angle for 1.064μm calculated by Sellmeier equation gives good agreement with experimental value.The TiO_(2) and Nd2O_(3) doping cause the decrease of the birefringence and the increase of the phase matching angle.The conversion efficiency is enhanced by TiO_(2) doping.The second harmonic generator with conversion efficiency of more than 44%has been achieved at room temperature with phase matching angle close to 90°.
文摘The influence of Nd:MgO:LiNbO_(3) composition on the optical quality and resistance to photorefraction has been studied.Nd:MgO:LiNbO3(1molNd_(2)O_(3),7.5mol%MgO)crystal has been found to have enhanced resitance to photorc-fraction,lower phase matching temperature and good optical quality.This crystal is promising material for self-frequency-doubled and self-Q-switched laser devices.
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.
文摘The transformation horn stage-2 to stage-1 in HC1O_(4)-graphite intercalation compounds is studied by in-situ Raman scattering.The results show the coexistence of well-ordered regions of both stages during the stage transition.The resonant enhancement of Raman scattering has been found in stage1 and stage-2 HC1O_(4)-GICs.
