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首页> 外文期刊>Applied optics >Integrated optics for astronomical interferometry. III. Optical validation of a planar optics two-telescope beam combiner
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Integrated optics for astronomical interferometry. III. Optical validation of a planar optics two-telescope beam combiner

机译：用于天文干涉测量的集成光学元件。三，平面光学两望远镜合束器的光学验证

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摘要

The optical characterization of a fiber-connected planar optics beam combiner dedicated to astronomical interferometry for two telescopes is presented. The beam combiner, fully integrated on a single 5 mm×40 mm glass chip, is tested as the central part of an astronomical instrument. The single-mode waveguides are made by silver-ion-exchange technology upon glass substrates and provide spatial filtering, which improves the visibility measurement accuracy by selecting only the fundamental mode of the beams at the telescope focal plane. A global optical throughput of 43% is measured, and the sources of losses are identified and examined in detail. Solutions for improving this throughput are proposed. High and stable contrasts are obtained with a 1.55-μm laser diode (approx.>96%) and with a white-light source (～92%) in the astronomical H filter (1.43 μm; 1.77 μm). The need for accurate control of differential instrumental polarization is demonstrated. In this context the intrinsic polarization-maintaining property of the planar optics component is characterized. This validation of the important potential uses of integrated planar optics should be valuable for future design of optical telescope arrays.
机译：提出了专用于两台望远镜的天文干涉测量的光纤连接的平面光学光束组合器的光学特性。完全集成在单个5 mm×40 mm玻璃芯片上的合束器已作为天文仪器的中心部分进行了测试。单模波导是通过银离子交换技术在玻璃基板上制成的，并提供空间滤波，通过仅选择望远镜焦平面上光束的基本模，可以提高可见度测量精度。测量的全球光吞吐率为43％，并确定并详细检查了损失的来源。提出了用于提高该吞吐量的解决方案。在天文H滤镜（1.43μm; 1.77μm）中，使用1.55μm激光二极管（约> 96％）和白光源（〜92％）可获得高而稳定的对比度。证明了需要精确控制差分仪器偏振的需求。在此，表征了平面光学器件的固有的偏振保持特性。对集成平面光学器件潜在重要用途的验证对于光学望远镜阵列的未来设计应该是有价值的。

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