Astrophotonics (AP)
Photonics-based mid-infrared interferometry II:
Photonics-based mid-infrared interferometry II: design, fabrication and monochromatic characterization of laser-written multi-telescope combiners
R. Diener, J. Tepper, L. Labadie, T. Pertsch, S. Nolte, and S. Minardi
Proceedings Volume 10701, Optical and Infrared Interferometry and Imaging VI; 107011R (2018)

In this contribution, we review the results of the ALSI project (Advanced Laser-writing for Stellar Interferometry), aimed at assessing the potential of ultrafast laser writing to fabricate mid-infared integrated optics (IO) devices with performance compatible with an implementation in real interferometric instruments like Hi5 or PFI. Waveguides for the L, L' and M bands with moderate propagation losses were manufactured in Gallium Lanthanum Sulfide and ZBLAN glasses and used to develop photonic building blocks as well as a full mid-IR 4-telescope beam combiner. We discuss the advantages and disadvantages of the tested combiners and discuss a possible roadmap for the continuation of this work.
Conference Proceedings