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21 July 2010 Integrated optic beam combiners for stellar interferometry and nulling at near- and mid-infrared wavelengths
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Abstract
Integrated optic, stellar interferometric two-beam and three-beam combiners have been designed and fabricated for operation in the L band (3 μm - 4 μm). The devices have been realized in titanium-indiffused, x-cut lithium niobate substrates, and on-chip electro-optic fringe scanning has been demonstrated. White light fringes were produced in the laboratory using the two-beam combiner integrated with an on-chip Y-splitter. Furthermore, a new design for next-generation, broadband, achromatic, astronomical, beam combiners operating in the N band (8 μm - 12 μm) is proposed and analyzed. The design is based on adiabatic mode-evolution couplers fabricated using Ge/Si heterostructure rib waveguides.
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Hsien-kai Hsiao, Kim A. Winick, John D. Monnier, and Jean-Philippe Berger "Integrated optic beam combiners for stellar interferometry and nulling at near- and mid-infrared wavelengths", Proc. SPIE 7734, Optical and Infrared Interferometry II, 77342T (21 July 2010); https://doi.org/10.1117/12.858295
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