PERSEE, the dynamic nulling demonstrator: recent progress on the cophasing system

K. Houairi; F. Cassaing; J. M. Le Duigou; B. Sorrente; S. Jacquinod; J. P. Amans

doi:10.1117/12.789113

28 July 2008 PERSEE, the dynamic nulling demonstrator: recent progress on the cophasing system

K. Houairi, F. Cassaing, J. M. Le Duigou, B. Sorrente, S. Jacquinod, J. P. Amans

Proceedings Volume 7013, Optical and Infrared Interferometry; 70131W (2008) https://doi.org/10.1117/12.789113
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

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.

Citation Download Citation

K. Houairi, F. Cassaing, J. M. Le Duigou, B. Sorrente, S. Jacquinod, and 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); https://doi.org/10.1117/12.789113

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