24 July 2014 High performance 3D waveguide architecture for astronomical pupil-remapping interferometry
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Abstract
Here we demonstrate a new generation of photonic pupil-remapping devices which build upon the interferometric framework developed for the Dragonfly instrument: a high contrast waveguide-based device which recovers robust complex visibility observables. New generation Dragonfly devices overcome problems caused by interference from unguided light and low throughput, promising unprecedented on-sky performance. Closure phase measurement scatter of only ~0.2° has been achieved, with waveguide throughputs of > 70%. This translates to a maximum contrast-ratio sensitivity (between the host star and its orbiting planet) at 1λ /D (1σ detection) of 5.3×10−4 (when a conventional adaptive-optics (AO) system is used) or 1.8×10−4 (for typical ‘extreme-AO’ performance), improving even further when random error is minimised by averaging over multiple exposures. This is an order of magnitude beyond conventional pupil-segmenting interferometry techniques (such as aperture masking), allowing a previously inaccessible part of the star to planet contrast-separation parameter space to be explored.
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Simon Gross, Simon Gross, Barnaby R. Norris, Barnaby R. Norris, Nick Cvetojevic, Nick Cvetojevic, Nemanja Jovanovic, Nemanja Jovanovic, Alexander Arriola Martiarena, Alexander Arriola Martiarena, Paul N. Stewart, Paul N. Stewart, Jon S. Lawrence, Jon S. Lawrence, Michael J. Withford, Michael J. Withford, Peter G. Tuthill, Peter G. Tuthill, } "High performance 3D waveguide architecture for astronomical pupil-remapping interferometry", Proc. SPIE 9146, Optical and Infrared Interferometry IV, 91461B (24 July 2014); doi: 10.1117/12.2057282; https://doi.org/10.1117/12.2057282
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