Photonic chip for visible interferometry: laboratory characterization and comparison with the theoretical model

29 August 2022 Photonic chip for visible interferometry: laboratory characterization and comparison with the theoretical model

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Proceedings Volume 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V; 121882F (2022) https://doi.org/10.1117/12.2629449
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

Integrated optics are used to achieve astronomical interferometry inside robust and compact materials, improving the instruments stability and sensitivity. In order to perform differential phase measurements at the Hα line (656.3nm) with the 600-800nm spectro-interferometer FIRST, a photonic integrated circuit (PIC) is being developed. This PIC performs the visible combination of the beams coming from the telescope pupil sub-apertures. In this work, TEEM Photonics waveguides fabricated by K+ : Na+ ion exchange in glass are characterized in terms of single-mode range and mode field diameter. The waveguide diffused index profile is modeled on Beamprop software. FIRST beam combiner building blocks are simulated, especially achromatic directional couplers and passive π/2 phase shifters for a potential ABCD interferometric combination.

Conference Presentation

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Manon Lallement, Sylvestre Lacour, Elsa Huby, Guillermo Martin, Kevin Barjot, Guy Perrin, Daniel Rouan, Vincent Lapeyrere, Sébastien Vievard, Olivier Guyon, Julien Lozi, Vincent Deo, Takayuki Kotani, Cecil Pham, Cedric Cassagnettes, Adrien Billat, Nick Cvetojevic, and Franck Marchis "Photonic chip for visible interferometry: laboratory characterization and comparison with the theoretical model", Proc. SPIE 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V, 121882F (29 August 2022); https://doi.org/10.1117/12.2629449

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