Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010spie.7734e..89h&link_type=abstract
Optical and Infrared Interferometry II. Edited by Danchi, William C.; Delplancke, Françoise; Rajagopal, Jayadev K. Proceeding
Astronomy and Astrophysics
Astronomy
1
Scientific paper
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.
Berger Jean Philippe
Hsiao Hsien-kai
Monnier John D.
Winick Kim A.
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