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Proceedings Paper

Fringe tracking at longer wavelengths using near- and mid-IR integrated optics devices
Author(s): Balaji Muthusubramanian; Lucas Labadie; Jörg-Uwe Pott; Jan Tepper; Stefano Minardi; Romina Diener
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Paper Abstract

Fringe tracking at longer wavelengths is advantageous for its larger Fried parameter (R0) and longer coherence time (τ0). The fringe trackers which are currently available at the VLTi (Finito, FSU, Gravity, etc.) tracks fringes at the near infrared wavelengths (H and K bands). In our work we try to explore the possibilities to track near and mid- infrared fringes using GLS based laser written integrated optics beam combiners. We simulate the atmospheric optical path difference (OPD) using Kolmogorov/Von-Karman atmospheric turbulence statistics. We also include the measured the piston noise generated due to the instrumental vibrations. Using the resulting OPD time series we can estimate the sensitivity of the fringe tracker at the L band.

Paper Details

Date Published: 4 August 2016
PDF: 11 pages
Proc. SPIE 9907, Optical and Infrared Interferometry and Imaging V, 990736 (4 August 2016); doi: 10.1117/12.2232610
Show Author Affiliations
Balaji Muthusubramanian, I. Physikalisches Institut (Germany)
Lucas Labadie, I. Physikalisches Institut (Germany)
Jörg-Uwe Pott, Max Planck Institute for Astronomy (Germany)
Jan Tepper, I. Physikalisches Institut (Germany)
Stefano Minardi, Friedrich-Schiller-Univ. Jena (Germany)
Leibniz-Institut für Astrophysik Potsdam (Germany)
Romina Diener, Friedrich-Schiller-Univ. Jena (Germany)

Published in SPIE Proceedings Vol. 9907:
Optical and Infrared Interferometry and Imaging V
Fabien Malbet; Michelle J. Creech-Eakman; Peter G. Tuthill, Editor(s)

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