Adaptive phase-mask coronagraph with amplitude and phase modulation for high dynamic range synchronous detection: APM2 coronagraph

P. Bourget; D. Mawet; P. Mardones; N. Schuhler; L. Pueyo; J. Girard; P. Haguenauer; F. Gonte

doi:10.1117/12.2026211

26 September 2013 Adaptive phase-mask coronagraph with amplitude and phase modulation for high dynamic range synchronous detection: APM² coronagraph

P. Bourget, D. Mawet, P. Mardones, N. Schuhler, L. Pueyo, J. Girard, P. Haguenauer, F. Gonte

Author Affiliations +

Proceedings Volume 8864, Techniques and Instrumentation for Detection of Exoplanets VI; 88640J (2013) https://doi.org/10.1117/12.2026211
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

We present a new Adaptive Phase Mask (APM) coronagraph design enabling Amplitude and Phase Modulation control (APM). The Adaptive Phase mask coronagraph is a technique proposed to provide both high dynamic and high angular resolution imaging of faint sources around bright objects. Discriminating faint sources from static speckles is a challenging problem. Our new system is based on synchronous demodulation that allows high dynamic range detection of a faint target immersed in a background. The APM² uses the coherence of speckles to discriminate them from proper companions, using the mask itself as the electric field modulator. Synchronous detection in the radio frequency range is used to side-step the effect of atmospheric turbulence and enable the detection of low amplitude signals. The APM² concept offers high dynamic range detection and provides a time- and cost-effective method to quantify the probability of presence of a faint object close to the central star.

Citation Download Citation

P. Bourget, D. Mawet, P. Mardones, N. Schuhler, L. Pueyo, J. Girard, P. Haguenauer, and F. Gonte "Adaptive phase-mask coronagraph with amplitude and phase modulation for high dynamic range synchronous detection: APM² coronagraph", Proc. SPIE 8864, Techniques and Instrumentation for Detection of Exoplanets VI, 88640J (26 September 2013); https://doi.org/10.1117/12.2026211

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KEYWORDS

Phase shift keying

Coronagraphy

Modulation

Phase modulation

Amplitude modulation

Avalanche photodetectors

Speckle

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