  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.
