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- W4381561262 abstract "We have built and characterized a six-telescope near-infrared discrete beam combiner (DBC) for stellar interferometry using the technique of ultrafast laser inscription (ULI). The 3D beam combiner consists of evanescently coupled waveguides fabricated in borosilicate glass, with a throughput of around 56%. Devices of two design types are characterized over the astronomical J and H band. Using the 15 non-redundant combinations of pairs, we populate the elements of the visibility-to-pixel matrix (V2PM) of the beam combiner using a two-input Michelson interferometer setup. We identify the complex visibility as wavelength dependent, with different optimum wavelengths for the two types of devices. For the design that includes a fan-in region, a baseline-averaged mean visibility amplitude of 1.05 and relative precision of 2.9% and 3.8% are extracted for characterization at 1328 nm and 1380 nm, respectively. Operation is also possible in the H-band, with a relative precision of 4.8% at 1520 nm. Broadband characterization is subject to dispersion effects, but gives similar performance results to their monochromatic counterparts in the J-band at 1350 nm." @default.
- W4381561262 created "2023-06-22" @default.
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- W4381561262 date "2023-06-18" @default.
- W4381561262 modified "2023-09-26" @default.
- W4381561262 title "Practical demonstration of a six-telescope integrated optics beam combiner for the astronomical J- and H-band manufactured with ultrafast laser inscription" @default.
- W4381561262 doi "https://doi.org/10.48550/arxiv.2306.10575" @default.
- W4381561262 hasPublicationYear "2023" @default.
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