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Integrated optic beam combiners in lithium niobate for stellar interferometer

机译:铌酸锂中的集成光束组合器,用于恒星干涉仪

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Integrated optics can provide compact and robust solutions for ground and space-based interferometry by integrating optical devices with different functionalities, such as spatial filters, combiners/millers, and phase modulators, on a single chip. Lithium niobate (LiNbO_3) has two distinct advantages over silica-based technologies, including good transparency further into the near-infrared (covering J, H, K, and L bands) and the ability to support electrically-controlled phase modulation through the linear electro-optic (EO) effect. The design, fabrication and preliminary tests of integrated optic components on LiNbO_3 substrates for astronomical beam combiners operating in the H and L bands is reported. The components include single-mode waveguides of sufficient length for spatial filtering, symmetric junctions for wavelength insensitive power splitters/combiners, and electro-optic waveguide modulators for path-length control.
机译:通过将具有不同功能的光学设备(例如空间滤波器,组合器/米勒和相位调制器)集成在单个芯片上,集成光学器件可以为地面和基于空间的干涉测量提供紧凑而强大的解决方案。铌酸锂(LiNbO_3)与基于二氧化硅的技术相比具有两个明显的优势,包括对近红外具有良好的透明度(覆盖J,H,K和L波段),以及通过线性电势支持电控相位调制的能力-光学(EO)效果。报告了在LiNbO_3衬底上集成光学组件的设计,制造和初步测试,这些衬底用于在H和L波段工作的天文合束器。这些组件包括长度足以进行空间滤波的单模波导,用于波长不敏感的功率分配器/组合器的对称结,以及用于路径长度控制的电光波导调制器。

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