CuO and Co2O3 were doped in KNSBN and Czochralski method was used to grow Cu:Co:KNSBN crystal for the first time. ZnO and Fe2O3 were doped in LiNbO3 and Czochralski method was used to grow Zn:Fe:LiNbO3 crystals. The diffraction efficiency and response time of the Zn:Fe:LiNbO3 crystals were measured. The response speed of the Zn:Fe:LiNbO3 crystal is four times higher than that of the Fe:LiNbO3 crystal. The self-pumping phase conjugate reflectivity and respond time of the Cu:Co:KNSBN crystal were measured. The result shows that the self-pumping phase conjugate reflectivity of the Cu:Co:KNSBN crystal is two time higher than that of KNSBN crystal. Zn:Fe:LiNbO3 and Cu:Co:KNSBN were used as storage element and self-pumping phase conjugate mirror, respectively, to make the holographic associative storage experiment. The excellent results were gained.
Mg:Fe:LiTaO3 crystals were first grown by Czochralski method, and Fe:LiTaO3 crystals, Fe:LiNbO3 and Mg:Fe:LiNbO3 crystals were also grown at the same time. The holographic storage properties of these crystals, such as the exponential gain coefficient, the diffraction efficiency and the response time, were measured by the two-wave coupling method. It was found that the response speed of Mg:Fe:LiTaO3 crystal was five times faster than that of Fe:LiTaO3. The light scattering resistance ability was also measured, and that of Mg:Fe:LiTaO3 crystal was two orders of magnitude higher than that of Fe:LiTaO3 as well as higher than that of Mg:Fe:LiNbO3. The enhancement mechanism of the photorefractive properties for Mg:Fe:LiTaO3 crystal was discussed for the first time.
In our conduction traditional polarization technology, it is difficult to make the doping ions distribute uniformly. The alternative polarization technique is used to make the Fe3+ and Fe2+ distribute uniformly in the doped LiNbO3 crystals by controlling polarization temperature, polarization time and polarization current. The properties of the crystals are improved greatly.
The Zn:Fe:LiNbO3 crystals with vary concentration of ZnO and Fe2O3 in the melt were grown by Czochralski technique. The polarization conduction is change to improve the holographic storage properties of the Zn:Fe:LiNbO3 crystal. The optical damage resistance of Zn:Fe:LiNbO3 is two orders magnitude higher than that of Fe:LiNbO3 crystal. Its response time is several seconds. The picture stored in Zn:Fe:LiNbO3 crystal is clear and it has low noise. The experiment result shows the Zn:Fe:LiNbO3 crystal is perfect holographic storage material.
Doping CuO, Ce2O3 and ZnO in LiNbO3, Zn:Ce:Cu:LiNbO3 crystals are grown by the Czochralski method. The optical properties of the crystals are investigated, including photorefractive properties and spectrum properties. The photo scattering resistance ability of the crystal is one order of magnitude higher than that of Ce:Cu:LiNbO3 and the writing time of the crystal is as half time short as that of Ce:Cu:LiNbO3. The absorption spectra and infrared spectra of Zn:Ce:Cu:LiNbO3 were measured. The mechanism of the photo scattering resistance ability of Zn:Ce:Cu:LiNbO3 was investigated.
La:Zn:KLN single crystal was grown by the Czochralski method with the dimensions of 10x10x35mm. The crystal was polarized. The crystal structure was determined by X-ray diffraction. The Curie point was determined by the difference thermal analysis. The infrared spectra was obtained. The doubling frequency light of 434nm was obtained in the La:Zn:KLN with the base light of 868nm.
Ce:Eu:SBN single crystal was grown by the Czochralski method. The crystal was polarized. The exponential gain coefficient, response time and diffraction efficiency were measured by the two beam coupling. The phase conjugation reflectivity was also measured by four beam mixed path. The results showed that the photorefractive effect of Ce:Eu:SBN was superior to that of SBN and Ce:SBN.
Nd:YVO4 crystal was successfully grown by the Czochralski method. The crystal growth process was described in detail: The transmittance and emission spectra of Nd:YVO4 crystal have been measured. The wavlength of the main absorption peak is centered at 808.97nm, and that of the emission peak is centered at 1064nm. The fluoresence lifetime of (formula available in paper).
Doping ZnO and Ga2O3 in LiNbO3 crystal, the Zn:Ga:LiNbO3 was grown by Czochralski method. The IR transmission spectra and the photon damage resistance ability of the LiNbO3 and Zn:Ga:LiNbO3 crystal were measured. The proton exchange technology was used to make the LiNbO3 and Zn:Ga:LiNbO3 crystal waveguide substrates. The m-line method was taken to study the photo damage of waveguide substrate. We observed that the threshold of Zn:Ga:LiNbO3 is above two magnitude higher than that of Mg:LiNbO3. Zn:Ga:LiNbO3 crystal is better performance than LiNbO3 crystal.
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