Computer Science – Performance
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aspc..430..432g&link_type=abstract
Pathways Towards Habitable Planets, proceedings of a workshop held 14 to 18 September 2009 in Barcelona, Spain. Edited by Vincen
Computer Science
Performance
Scientific paper
Nulling interferometry has been suggested as the underlying principle for an instrument which could provide direct detection and spectroscopy of Earth-like exoplanets, including searches for potential biomarkers (Darwin/TPF-I). Several aspects of this method require further research and development. The NULLTIMATE testbed at the Institut d’Astrophysique Spatiale in Orsay, France, is a new instrument, built in late 2008. It is designed to test different achromatic phase shifters (focus crossing, field reversal, dielectric plates) at 300 K using various sources ranging from 2 to 10 μm, with special attention to stabilization (optical path difference and beam intensity balance). Its operational parameters (null depth and stability) were tested with a monochromatic laser sources at 2.32 and 3.39 μm and with a supercontinuum source in the K band. This poster presents a progress report on its performance with a focus crossing achromatic phase shifter.
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