Near-stoichiometric LiNbO3 single crystals codoped with Zn and Fe (Zn:Fe:NSLN) were grown by Czochralski (CZ) method using Li-rich melts. Structure analysis was performed by the X-ray powder diffraction and ultraviolet–visible (UV) absorption spectra in these samples. Experimental results showed that the lattice constant values increased with the increasing ZnO content in melt and ultraviolet absorption edge shifts to the shorter wavelength when compared with pure near-stoichiometric sample in Zn:Fe:NSLN. In addition, the optical damage resistance was also measured, which was several order of magnitude increased when compared with near-stoichiometric LiNbO3:Fe (Fe:NSLN) crystal. Holographic experiments were performed to analyze quantitatively the enhancement of the optical damage resistance.

以普通商用TiO2为原料，与铝粉、碳化硼进行自蔓延(SHS)高温合成TiB2／Al2O3复合材料，通过差热和X射线衍射分析，确定了TiO2、Al及B4C的反应机制，得到了生成TiB2／Al2O3复合粉体的最佳工艺条件。测定了TiB2／AI203复合粉体相关的力学性能，得到材料的抗压强度为87.2MPa，抗弯曲强度为104.3MPa。SEM观察发现生成相中存在大量的气相或气孔，生成物微观区域不太均匀，材料的断裂形式主要为脆性断裂，生成物的颗粒尺寸为亚微米级。

Three kinds of different Zn: Fe: LiNbO3 wafers are pre- pared by proper reduction or oxidation post-treatment processes. The optical-damage-resistance abilities and photorefractive properties are studied using the optical compensator technique and two-wave coupling measurement, respectively. The holographic storage properties, that is, diffraction efficiency, writing time, erasure time, photorefractive sensitivity, and dynamic range, are also measured or calculated. The analyses indicate that the sample disposed by reduction is the most proper media for holographic storage application.

A series of Sc: Ce: Cu: LiNbO3 crystals were prepared using the Czochralski method and the occupation mechanism of the dopants is discussed in terms of the results of infrared and UV–visible spectra. The optical damage resistance ability and quasi-nonvolatile holographic properties of the samples were also obtained. The defect structure is discussed, accounting for the optical damage resistance and two-photon holographic response speed.

A series of near-stoichiometric Zn: LiNbO3 (Zn: NSLN) crystals were grown by the top seed solution growth (TSSG) method using K2Oas flux. Defect structures and Zn2+ occupation mechanism were analyzed and discussed by X-ray powder diffraction (XRD), differential thermal analysis (DTA), ultraviolet-visible (UV) absorption and infrared (IR) spectrum measurement. Moreover, we also found that the threshold concentration of ZnO in NSLN were between 2 and 3 mol%.