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Proceedings Paper

Femtosecond laser writing of 3D polarization insensitive integrated devices for astrophotonics (Conference Presentation)

Paper Abstract

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.

Paper Details

Date Published: 9 March 2020
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Proc. SPIE 11270, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XX, 112700S (9 March 2020);
Show Author Affiliations
Simone Piacentini, Politecnico di Milano (Italy)
CNR-Istituto di Fotonica e Nanotecnologie (Italy)
Giacomo Corrielli, CNR-Istituto di Fotonica e Nanotecnologie (Italy)
Abani Shankar Nayak, Leibniz-Institut für Astrophysik Potsdam (Germany)
Tarun Kumar Sharma, Univ. zu Köln (Germany)
Kalaga V. Madhav, Leibniz-Institut für Astrophysik Potsdam (Germany)
Andrea Adami, Politecnico di Milano (Italy)
Ettore Pedretti, STFC Rutherford Appleton Lab. (United Kingdom)
Stefano Minardi, Leibniz-Institut für Astrophysik Potsdam (Germany)
Lucas Labadie, Univ. zu Köln (Germany)
Roberto Osellame, CNR-Istituto di Fotonica e Nanotecnologie (Italy)


Published in SPIE Proceedings Vol. 11270:
Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XX
Peter R. Herman; Michel Meunier; Roberto Osellame, Editor(s)

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