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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 358689.0, MPI für Astronomie / Publikationen_mpia
Mid-infrared laser light nulling experiment using single-mode conductive waveguides
Authors:Labadie, L.; Le Coarer, E.; Maurand, R.; Labeye, P.; Kern, P.; Arezki, B.; Broquin, J. E.
Date of Publication (YYYY-MM-DD):2007
Title of Journal:Astronomy and Astrophysics
Issue / Number:1
Start Page:355
End Page:360
Audience:Not Specified
Abstract / Description:Aims: In the context of space interferometry missions devoted to the search of exo-Earths, this paper investigates the capabilities of new single mode conductive waveguides at providing modal filtering in an infrared and monochromatic nulling experiment; Methods: A Michelson laser interferometer with a co-axial beam combination scheme at 10.6 microns is used. After introducing a Pi phase shift using a translating mirror, dynamic and static measurements of the nulling ratio are performed in the two cases where modal filtering is implemented and suppressed. No additional active control of the wavefront errors is involved. Results: We achieve on average a statistical nulling ratio of 2.5e-4 with a 1-sigma upper limit of 6e-4, while a best null of 5.6e-5 is obtained in static mode. At the moment, the impact of external vibrations limits our ability to maintain the null to 10 to 20 seconds.; Conclusions: A positive effect of SM conductive waveguide on modal filtering has been observed in this study. Further improvement of the null should be possible with proper mechanical isolation of the setup.
Free Keywords:Astrophysics
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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