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arXiv 0904.3030astro-ph.IM
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用于恒星干涉测量的集成光学元件

Integrated optics components for stellar interferometry

Pierre Labeye

摘要:

最近的研究表明,集成光学可以提高恒星干涉测量技术的精度、稳定性和易用性。本论文的主题是研究一种基于单模波导的光学元件,用以将来自四个望远镜的光束进行相干重组。建议的架构提供了一个同时的瞬时测量复杂的可见性的干涉信号的六个可能的望远镜对。该器件针对大气H波段的消色差特性进行了优化,并集成了一个消色差移相器,以获得四个相位正交的干涉条纹。通过在硅衬底上沉积和蚀刻二氧化硅层实现的器件上获得的光学表征结果证实了理论预测,并使VLTI第二代仪器项目的核心能够研究更复杂的组件。(甚大望远镜干涉仪)这项研究表明,所提出的架构可以扩展到J和K光谱波段,可以应用于来自六个甚至八个望远镜的光束的重组,并且还可以应用于实现条纹跟踪器。

英文摘要:

It has been recently demonstrated that integrated optics could enhance accuracy, stability, and ease of use of stellar interferometry techniques. The subject of this thesis is the study of an optical component based on singlemode waveguides for the coherent recombining of optical beams coming from four telescopes. Proposed architecture provides a simultaneous an instantaneous measurement of complex visibility of interferometric signals of the six possible pairs of telescopes. The component is optimized for achromatic behaviour over the H spectral transparency band of atmosphere and integrates an original achromatic phase shifter in order to obtain four phase quadrature states of interferometric fringes. Optical characterisation results obtained on devices realized by deposition and etching of silica layers on silicon substrate confirm theoretical predictions et enabled the study of more complex components at the heart of second generation instrumentation projects of the VLTI (Very Large Telescope Interferometer) This study shows that proposed architecture can be extended to J and K spectral bands, can be applied for the recombination of beams coming from six and even eight telescopes and could also be applied to realise a fringe tracker.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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