28 July 2008 PERSEE, the dynamic nulling demonstrator: recent progress on the cophasing system
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Spectral characterization of exo-planets can be made by nulling interferometers. In this context, several projects have been proposed such as DARWIN, FKSI, PEGASE and TPF, space-based, and ALADDIN, ground-based. To stabilize the beams with the required nanometric accuracy, a cophasing system is required, made of piston/tip/tilt actuators on each arm and piston/tip-tilt sensors. The demonstration of the feasibility of such a cophasing system is a central issue. In this goal, a laboratory breadboard named PERSEE is under integration. Main goals of PERSEE are the demonstration of a polychromatic null from 1.65 μm to 3.3 μm with a 10-4 rejection rate and a 10-5 stability despite the introduction of realistic perturbations, the study of the interfaces with formation-flying spacecrafts and the joint operation of the cophasing system with the nuller. We describe the principle of the cophasing system made by Onera, operating in the [0.8 - 1] μm (tip/tilt) and [0.8 - 1.5] μm (piston) spectral bands. Emphasis is put on the piston sensor and its close integration with the nuller.
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K. Houairi, K. Houairi, F. Cassaing, F. Cassaing, J. M. Le Duigou, J. M. Le Duigou, B. Sorrente, B. Sorrente, S. Jacquinod, S. Jacquinod, J. P. Amans, J. P. Amans, } "PERSEE, the dynamic nulling demonstrator: recent progress on the cophasing system", Proc. SPIE 7013, Optical and Infrared Interferometry, 70131W (28 July 2008); doi: 10.1117/12.789113; https://doi.org/10.1117/12.789113

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