4 August 2016 Fringe tracking at longer wavelengths using near- and mid-IR integrated optics devices
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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.
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Balaji Muthusubramanian, Lucas Labadie, Jörg-Uwe Pott, Jan Tepper, Stefano Minardi, Romina Diener, "Fringe tracking at longer wavelengths using near- and mid-IR integrated optics devices", Proc. SPIE 9907, Optical and Infrared Interferometry and Imaging V, 990736 (4 August 2016); doi: 10.1117/12.2232610; https://doi.org/10.1117/12.2232610
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