Simone Piacentini,1,2 Giacomo Corrielli,2 Abani Shankar Nayak,3 Tarun Kumar Sharma,4 Kalaga V. Madhavhttps://orcid.org/0000-0002-6711-7137,3 Andrea Adami,1 Ettore Pedretti,5 Stefano Minardi,6 Lucas Labadie,4 Roberto Osellame2
1Politecnico di Milano (Italy) 2CNR-Istituto di Fotonica e Nanotecnologie (Italy) 3Leibniz-Institut für Astrophysik Potsdam (Germany) 4Univ. zu Köln (Germany) 5STFC Rutherford Appleton Lab. (United Kingdom) 6Leibniz-Institut für Astrophysik Potsdam (Germany)
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Astrophotonics is an emerging tool for increasing the angular resolution in ground-based sky observations. Due to the unpolarized nature of celestial light, it is necessary to operate with fully polarization insensitive integrated devices. In this respect, here we show that a thermal annealing after the femtosecond laser writing of waveguides reduces their birefringence of more than order of magnitude, providing integrated circuits whose behaviour is insensitive to the polarization of the input light. As a validation of this technique, we present the successful fabrication of a low-loss integrated device for performing stellar interferometry of up to 8 input beams.
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