28 July 2014 High-contrast imaging in wide spectral band with a self-coherent camera and achromatic coronagraphs
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Direct imaging of exoplanets is very attractive but challenging. It requires high angular resolution and very high-contrast imaging. One solution is the use of coronagraphs behind the adaptive optics of large telescopes. Unfortunately, optics of space telescope and ground telescope introduce quasi-static aberrations which strongly limit the quality of the final image and a dedicated stage of adaptive optics is required. We proposed a self- coherent camera (SCC) in 2006 and we obtained contrast levels of (approximately equal to) 2 10-8 at a few λ0=D at 638 nm in laboratory. In this paper, we explain how to achromatize the SCC. We present laboratory performance in wide spectral band (approximately equal to) 5 - 10 % bandpass.
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J. R. Delorme, J. R. Delorme, R. Galicher, R. Galicher, P. Baudoz, P. Baudoz, G. Rousset, G. Rousset, J. Mazoyer, J. Mazoyer, M. N'Diaye, M. N'Diaye, K. Dohlen, K. Dohlen, A. Caillat, A. Caillat, "High-contrast imaging in wide spectral band with a self-coherent camera and achromatic coronagraphs", Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91515Q (28 July 2014); doi: 10.1117/12.2056846; https://doi.org/10.1117/12.2056846

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