掺Ce,Fe系列LiNbO3晶体光折变效应光存储特性

研究了系列Ce：Fe掺杂以及不同后处理态(生长态、还原态和氧化态)铌酸锂晶体的透过率光谱和光折变全息存储特性。实验结果表明单掺Ce铌酸锂晶体具有较好的图像存储质量和较宽的透过率光谱范围，二波耦合增益相对较低；高掺杂铌酸锂样品的透过率光谱范围较窄，光折变二波耦合增益较低。晶体的后处理对铌酸锂样品的光折变特性影响明显，双掺Ce:Fe还原态铌酸锂晶体具有较高的二波耦合增益；氧化态样品具有较大的透过率光谱范围；还原态样品具有较大的光折变二波耦合增益特性。实验结果还表明在同种样品中难于同时获得大的二波耦合增益和图像存储质量。

Photorefractive Holographic Storage Properties in Ce:Fe-Doped LiNbO3 Crystals

Photorefractive holographic storage and optical transmission spectra properties were studied in a series of Ce∶Fe-doped LiNbO3 crystals including different dopants, different concentrations of dopants, and different post-proposed samples (as-grown or reduced or oxidized). The experimental results show that the top-quality photorefractive holographic storage, the wide range of optical transmission spectra and the relatively small gain of two-wave coupling can be found in Ce-doped LiNbO3 crystal. The optical transmission spectra range and the gain of two-wave mixing is small in the high concentrations Fe-doped LiNbO3 crystals. Post-disposed (reduced or oxidized) samples had influence on the photorefractive property. The high gain of photorefractive two-wave coupling can be found in Ce∶Fe-doped reduced LiNbO3 crystal. The wider optical transmission spectra range can be obtained in the oxidized samples. And the greater gain of photorefractive two-wave coupling can be obtained in reduced samples. It is difficult to obtain the high gain of photorefractive two-wave coupling and the image storage quality simultaneously.