Study On Growth And Holographic Properties Of Cerium Zirconium Iron Triple-doped Lithium Niobate

The performance of the storage materials directly determines the practical applicationof volume holographic storage technology. Cerium iron lithium niobate (Ce:Fe:LiNbO3)crystals are one of the excellent performance of photorefractive volume holographicstorage materials found in recent years which have performance photorefractive, but it isstill inadequate, such as slow response and weak resistance to injury. Two methodscommonly used internationally to improve these problems: One is to improve the ratio oflithium niobium, and the other is incorporated into the optical damage resistance. Zr ionsare excellent resistance elements to optical damage in recent years. Therefore, the researchobject choose Zr:Ce:Fe:LiNbO3crystals with different contents of Zr ions which grown byCzochralski method, to study the growth process, spectral characteristics, the structure ofthe defect, photorefractive properties, and the ability to resist the optical damage.Firstly, by adjusting the growth process，no macroscopic defects and good opticalhomogeneity Zr:Ce:Fe:LiNbO3crystals are grown using Czochralski method，and theholographic storage devices are prepared after the processing of orientation, cutting,grinding and polishing.Secondly, using X-ray crystal powder diffraction, infrared spectrum and ultravioletabsorption spectrum etc. test means to analysis the crystal structure. And through thecrystal cell parameters change, OH-absorption peak position and crystal absorption edgemoving judge the defects of crystal structure and doping ions placeholder.Thirdly, through the two-wave coupling experimental test Zr:Ce:Fe:LiNbO3crystalphotorefractive properties. And by the measured writing time and erasing time to calculatethe diffraction efficiency of crystal, photorefractive sensitivity and dynamic range. Theexperimental results show that the Zr:Ce:Fe:LiNbO3crystal photorefractive properties arebetter than Ce:Fe:LiNbO3crystals.Finally, the resistance optical damage threshold of Zr:Ce:Fe:LiNbO3crystals werestudied by the transmission facula distortion method. The results show that with theincrease of zirconium content, Zr:Ce:Fe:LiNbO3crystal light damage resistance increase gradually. Compared with Ce:Fe:LiNbO3crystals, Zr:Ce:Fe:LiNbO3crystals have greaterthreshold intensity, better able to suppress the light scattering.