High performance 3D waveguide architecture for astronomical pupil-remapping interferometry

Simon Gross, Barnaby R. Norris, Nick Cvetojevic, Nemanja Jovanovic, Alexander Arriola Martiarena, Paul N. Stewart, Jon S. Lawrence, Michael J. Withford, Peter G. Tuthill

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

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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.

Original languageEnglish
Title of host publicationOptical and infrared interferometry IV
EditorsJayadev K. Rajagopal, Michelle J. Creech-Eakman, Fabien Malbet
Place of PublicationWashington, DC
PublisherSPIE
Pages91461B-1-91461B-12
Number of pages12
ISBN (Electronic)9780819496140
DOIs
Publication statusPublished - 2014
EventOptical and Infrared Interferometry IV - Montreal, Canada
Duration: 23 Jun 201427 Jun 2014

Publication series

NameProceedings of SPIE
PublisherSPIE
Volume9146
ISSN (Print)0277-786X

Other

OtherOptical and Infrared Interferometry IV
CountryCanada
CityMontreal
Period23/06/1427/06/14

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