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Spronck, J. (author), Pereira, S.F. (author), Braat, J.J.M. (author)We introduce a new concept of nulling interferometer without any achromatic device, using polarization properties of light. This type of interferometer should enable a high rejection ratio in a theoretically unlimited spectral band. We analyze several consequences of the proposed design, notably, the possibility of fast internal modulation.journal article 2006
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Spronck, J. (author), Pereira, S.F. (author), Braat, J.J.M. (author)We introduce the concept of chromatism compensation in nulling interferometry that enables a high rejection ratio in a wide spectral band. Therefore the achromaticity condition considered in most nulling interferometers can be relaxed. We show that this chromatism compensation cannot be applied to a two-beam nulling interferometer, and we make...journal article 2006
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Swinkels, B.L. (author), Bhattacharya, N. (author), Braat, J.J.M. (author)Absolute distance measurements can be performed with an interferometric method that uses only a single tunable laser. This method has one major drawback, because a small target movement of the order of one wavelength during a measurement will be interpreted as a movement of one synthetic wavelength. This effect is usually mitigated by adding a...journal article 2005
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Montilla, I. (author), Pereira, S.F. (author), Braat, J.J.M. (author)A new interferometric technique for Michelson wide-field interferometry is presented that consists of a Michelson pupil-plane combination scheme in which a wide field of view can be achieved in one shot. This technique uses a stair-shaped mirror in the intermediate image plane of each telescope in the array, allowing for simultaneous correction...journal article 2005