LiNbO_3:Ru晶体的光折变特性研究  

Photorefractive Characteristics Investigation in LiNbO_3∶Ru Crystals

作　　者：柴志方[1] 刘德安[1] 职亚楠[1] 郭袁俊[1] 刘立人[1] 

机构地区：[1]中国科学院上海光学精密机械研究所信息光学实验室,上海201800

出　　处：《光学学报》2006年第8期1245-1249,共5页Acta Optica Sinica

基　　金：科技部重大基础研究前期研究专项(2002CCA03500);国家自然科学基金(60177016)资助课题

摘　　要：采用丘克拉斯基法生长了单掺杂的LiNbO3∶Ru晶体,并对其作氧化处理。实验研究了LiNbO3∶Ru晶体二波混频条件下光栅记录特性和波长的依赖关系;并且研究了氧化处理对其透射谱和光栅记录特性的影响。研究结果表明,LiNbO3∶Ru晶体的最佳记录波长为458 nm;氧化处理会增加LiNbO3∶Ru晶体对光的吸收,同时提高光栅记录的灵敏度和饱和衍射效率,表现了不同于LiNbO3∶Fe晶体的氧化态依赖特性。分析认为,LiNbO3∶Ru晶体的反常氧化态依赖特性可能是由于出现了电子通道效应的暗衰减机制,以及Ru存在多个价态所造成的。LiNbO3：u crystals have been grown by Czochralski method, then oxidized in O2 for 20 h. Dependence of recording characteristics of grating on recording wavelength, as well as effect of oxidation treatment on transmission spectra and recording characteristics, has been investigated in LiNbO3 ： Ru crystal. The results show that the optimal recording wavelength is 458 nm; oxidation treatment increases the absorption of crystals, and also increases the recording sensitivity and saturated diffraction efficiency, which is different from the dependence on oxidation state in LiNbO3 ： Fe crystals. The abnormal oxidation state dependent characteristics may be induced by that the dark attenuation mechanison of electron tunneling is present, and Ru is in more than two valence states.

关 键 词：信息光学 LiNbO3:Ru晶体 透射谱 光折变特性 

分 类 号：O438.1[机械工程—光学工程] O7[理学—光学]