MgO:LiNb0.3与LiNb0.3质子交换光波导光学及结构特征的比较

利用退火的质子交换法在MgO:LiNbO.3和LiNbO.3两种材料上制作了光波导，得到了质子交换的扩散特性以及光波导折射率分布的退火规律．通过x射线衍射和OH-红外吸收谱方法研究了 MgO:LiNbO.3和LiNbO.3质子交换光波导的结构特征及其与退火参数的关系，对MgO :LiNbO.3和LiNbO.3光波导光学和结构特征的结果进行了分析和比较． 关键词： 退火质子交换光波导 晶格结构 x射线衍射 红外吸收     

质子交换LiNbO_3光波导

本文全面系统地综述了质子交换LiNbO3光波导的机理、结构特征和光学性质。描述了掺杂LiNbO3质子交换波导的特征 ,并与纯LiNbO3光波导进行了比较     

质子交换LiNbO_3光波导

本文全面系统地综述了质子交换LiNbO3光波导的机理、结构特征和光学性质。描述了掺杂LiNbO3质子交换波导的特征 ,并与纯LiNbO3光波导进行了比较     

质子交换LiNbO3光波导

本全面系统地综述了质子交换LiNbO3i光波导的机理、结构特征和光学性质。描述了掺杂LiNbO3质子交换波导的特征,并与纯LiNbO3光波导进行了比较。     

X切H∶LiNbO_3光波导的工艺仿真研究

对于X切H∶LiNbO3光波导,在532nm和1310nm波长下,用棱镜耦合器进行了工艺仿真研究.对于在150℃,180℃和200℃用苯甲酸质子交换的光波导,分别求得交换厚度与交换时间的关系曲线,在此基础上给出质子交换的扩散系数与交换温度的关系曲线.对于在180℃质子交换并在350℃退火的光波导,给出以交换时间(交换厚度)为参变量的表面折射率增量、有效厚度与退火时间的关系曲线.研究结果可供低损耗α相单模波导的设计和制备做参考.     

质子交换LiNbO3光波导的特性研究

采用X射线衍射谱法和红外吸收光谱法对质子交换和退火质子交换LiNbO3光波导的特性进行了研究.研究结果表明:在LiNbO3晶体衬底X射线衍射主峰的左侧出现质子交换LiNbO3光波导的伴峰,则质子交换使光波导层Li1-xHxNbO3的晶格常数比衬底的晶格常数稍大,产生垂直于表面的应变,波导经过退火后,伴峰向主峰靠近,应变减少.质子交换波导中的OH-基团的红外吸收光谱在3 500和3 300 cm-1处存在特征峰,波导经过退火后,3 300 cm-1处的特征峰基本消失,而3 500 cm-1处的吸收强度基本不变.实验还表明,OH-在3 500 cm-1处吸收带的积分面积基本与交换时间的开方呈正比例关系.     

红外吸收光谱确定质子交换LiNbO_3波导的深度

本文报道了利用红外光谱技术测量质子交换LiNbO3 光波导深度的一种新方法。该方法克服了传统的棱镜耦合技术 +IWKB方法只适用于多模波导不适用于单模波导缺点。实验结果表明该方法具有较好的准确性。     

掺镁铌酸锂质子交换光波导光学性能的研究

本文用质子交换反应在5mol％MgO:LiNbO_3晶体中引起了e光折射率的增加,晶体中MgO的存在并不影响LiNbO_3质子交换光波导阶跃型折射率分布的特点。用常规的质子交换法制备的MgO:LiNb·O_3波导存在着损耗大和有效折射率不稳定的缺点,经过退火处理后,这些缺点可明显地得到改善。     

集成光学

集成光学、波导理论TN2522007032549质子交换LiNbO3光波导的特性研究=Study on character-istics of proton-exchanged Li NbO3optical waveguides byX-ray diffraction and infrared absorption spectroscopy[刊,中]/符运良(海南师范学院物理系.海南,海口(571158)),何猛雄…//光谱学与光谱分析.?2006,26(12).?2346-2349采用X射线衍射谱法和红外吸收光谱法对质子交换和退火质子交换Li NbO3光波导的特性进行了研究。研究结果表明,在Li NbO3晶体衬底X射线衍射主峰的左侧出现质子交换Li NbO3光波导的伴峰,则质子交换使光波导层Li1-xH…     

气相质子交换LiTaO3光波导及其特性

本文利用苯甲酸气相质子交换技术制备了LiTaO3光波导，测量了Z-切LiTaO3光波导的参数（交换深度d和表面折射率增量△nc）和X-切LiTaO3光波导的红外吸收谱，给出了光波导层的折射率分布，并与液相质子交换热退火光波导的结果进行了比较。实验结果表明：非寻常折射率分布与热退火液相质子交换方法制备的LiTaO3光波导基本相近，但表面非寻常折射率增量（△nc）更大，其折射率分布更接近于高斯型。     

Characterization of Annealed, Proton Exchange Optical Waveguides in Y-cut MgO:LiNbO3 Crystal

It is reported the results of a systematic study on planar waveguides fabricated in Y-cut MgO:LiNbO3 crystal. The index profile of the as-exchanged waveguide can be modeled as a step-like one. It is deduced the diffusion coefficient and the activation energy for the proton exchange process. The surface index increases Δne of around 0.127 after proton exchange can be reduced by post thermal annealing. The effects of the annealing on the index profile and guide depth were found not as fast as it does on a pure LiNbO3 crystal.     

Characterization of Annealed, Proton Exchange Optical Waveguides in Y-cut MgO∶LiNbO3 Crystal

It is reported the results of a systematic study on planar waveguides fabricated in Y-cut MgO∶LiNbO3 crystal. The index profile of the as-exchanged waveguide can be modeled as a step-like one. It is deduced the diffusion coefficient and the activation energy for the proton exchange process. The surface index increases Δne of around 0.127 after proton exchange can be reduced by post thermal annealing. The effects of the annealing on the index profile and guide depth were found not as fast as it does on a pure LiNbO3 crystal.     

质子交换MgO:LiNbO3波导的双层结构

本文报导MgO:LiN_bO₃质子交换波导X射线双晶衍射和红外吸收的实验结果。这些结果表明质子交换波导由浅表面层和深表面层构成。浅表面层是一个连续应变层,有着大量随机排列的O—H—O形式的缔合OH^-基团。深表面层是一个均匀应变层,其内H⁺以自由OH^-基团形式出现。质子交换波导折射串不稳定性与双层结构中的结构驰豫密切相关。通过对质子交换过程的分析,提出两条避免双层结构的途径,其一为降低交换剂中的H⁺浓度,另一条是采用有限源工艺。     

Z切LiNbO3晶体中退火质子交换光波导特性的研究

系统地研究Ｚ切ＬｉＮｂＯ３晶体中质子交换波导和退火质子交换波导的特性,得到了质子交换过程中的扩散常数和激活能。发现了质子交换波导的折射率呈线性阶跃型的折射率分布。通过连续退火,波导的折射率分布由线性阶跃型向高斯型过渡。退火可分为两个阶段,波导深度的增加在第一阶段随退火时间成指数关系,第二阶段与退火时间的平方根成线性关系。     

Cr: LiNbO_3 Planar Waveguide

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Efficient green-light generation by proton-exchanged periodically poled MgO:LiNbO3 ridge waveguide

Efficient cw 532?nm green-light generation is demonstrated using a periodically poled MgO:LiNbO3 ridge waveguide prepared by a process that combines annealed proton exchange and precise dicing. Performance of waveguides with different widths has been investigated. The 6-μm-wide, 1.6-cm-long uncoated ridge waveguide has achieved a green output power of 127?mW under a coupled fundamental light power of 250?mW. The highest conversion efficiency achieved is 53%.     

Collinear acoustooptical interaction in annealed proton-exchanged LiNbO_3 waveguides

The performances of the proto-exchanged(PE) LiNbO_3 waveguides as a key ele-ment of acoustooptical deflector or spectrum analyzer were distinctly improved after anneal-ing.In this paper,reasons for the improvement are analysed by applying the theories of modecoupling and multilayer waveguides,so as to provide a theoretical basis for further improve-ment of the performances of the devices.     

LiNbO3 Self-Aligned Ridge Waveguide with Dielectric Side Buffers

A simple fabrication method of self-aligned ridge waveguides with dielectric side buffers is demonstrated on +Z-cut LiNbO3. The ridge waveguide is fabricated by a combination of the annealed proton exchange process and the proton-exchanged wet etching technique.