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Abstract: Aims: In the context of space interferometry missions devoted to the searchof exo-Earths, this paper investigates the capabilities of new single modeconductive waveguides at providing modal filtering in an infrared andmonochromatic nulling experiment; Methods: A Michelson laser interferometerwith a co-axial beam combination scheme at 10.6 microns is used. Afterintroducing a Pi phase shift using a translating mirror, dynamic and staticmeasurements of the nulling ratio are performed in the two cases where modalfiltering is implemented and suppressed. No additional active control of thewavefront errors is involved. Results: We achieve on average a statisticalnulling ratio of 2.5e-4 with a 1-sigma upper limit of 6e-4, while a best nullof 5.6e-5 is obtained in static mode. At the moment, the impact of externalvibrations limits our ability to maintain the null to 10 to 20 seconds.;Conclusions: A positive effect of SM conductive waveguide on modal filteringhas been observed in this study. Further improvement of the null should bepossible with proper mechanical isolation of the setup.



Autor: L. Labadie (MPIA), E. Le Coarer (LAOG), R. Maurand (LAOG), P. Labeye (CEA Leti), P. Kern (LAOG), B. Arezki (LAOG), J.-E. Broquin (LAOG)

Fuente: https://arxiv.org/







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