Hsiao Hsien-kai, Winick Kim A, Monnier John D
Department of Electrical Engineering and Computer Science, University of Michigan, 1301 Beal Avenue, Ann Arbor, Michigan 48109, USA.
Appl Opt. 2010 Dec 10;49(35):6675-88. doi: 10.1364/AO.49.006675.
Integrated optic beam combiners offer many advantages over conventional bulk optic implementations for astronomical imaging. To our knowledge, integrated optic beam combiners have only been demonstrated at operating wavelengths below 4 μm. Operation in the midinfrared wavelength region, however, is highly desirable. In this paper, a theoretical design technique based on three coupled waveguides is developed to achieve fully achromatic, broadband, polarization-insensitive, lossless beam combining. This design may make it possible to achieve the very deep broadband nulls needed for exoplanet searching.
与传统的体光学实现方式相比，集成光学光束组合器在天文成像方面具有许多优势。据我们所知，集成光学光束组合器仅在低于4μm的工作波长下得到了验证。然而，在中红外波长区域工作是非常有必要的。在本文中，我们开发了一种基于三个耦合波导的理论设计技术，以实现全消色差、宽带、偏振不敏感、无损的光束组合。这种设计可能使实现系外行星搜索所需的极深宽带零值成为可能。
