Advanced Laser-writing for Stellar Interferometry – ALSI
Funding agency: BMBF
Partners: University of Jena, University of Cologne, Max Plank Institute for Astronomy Heidelberg
Funding period: 2014-2017
With the ALSI project, we propose to focus on mastering the technology of laser-written
photonics in infrared glasses transparent in the 1-10 μm spectral range to develop near- and
mid-infrared integrated-optics beam combiners for future fringe-tracking systems for stellar
interferometry. The final goal of our proposal is to demonstrate the manufacturing of
sophisticated integrated optics beam combiners, which optimally respond to the specific
requirements and challenges of stellar interferometry (e.g. control of the phase errors, strong
immunity to vibrations, sensitivity in low-flux conditions). The outcome of this work will have
direct applications for fringe-tracking subsystems operating at longer infrared wavelengths
(2.2 to 3.6 microns) than today, which in the current infrastructure and science context of the
VLTI will contribute to broaden the science return of the facility.
A highlight of the preliminary results of the project is found [here]
The ALSI page at the university of Cologne is found [here].
ALSI will investigate and compare thevarious existing strategies for interferometric beam-combination with integrated optics in infrared transparent materials (2-4 microns).