High-contrast imaging in wide spectral band with a self-coherent camera and achromatic coronagraphs
Abstract
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.
- Publication:
-
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation
- Pub Date:
- July 2014
- DOI:
- 10.1117/12.2056846
- Bibcode:
- 2014SPIE.9151E..5QD