9 July 2018 Beam combination schemes and technologies for the Planet Formation Imager
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We present the results of the technology developments which lead to the manufacturing of the first integrated optics 2-telescope ABCD unit and 4-telescope DBC component for L-band, mid infrared stellar interferometry. All the samples were manufactured with ultrafast laser inscription in Gallium Lanthanum Sulfide and were characterized in near field with monochromatic light at the wavelength of 3.39 μm. The choice of the laser writing parameters and the control of long range stresses arising from the manufacturing process are discussed taking in consideration the measured interferometric calibration data.
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Ettore Pedretti, Romina Diener, Abani Shankar Nayak, Jan Tepper, Lucas Labadie, Thomas Pertsch, Stefan Nolte, and Stefano Minardi "Beam combination schemes and technologies for the Planet Formation Imager", Proc. SPIE 10701, Optical and Infrared Interferometry and Imaging VI, 107012O (9 July 2018); doi: 10.1117/12.2311955; https://doi.org/10.1117/12.2311955

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