Achromatic Eight-octant Phase-mask Coronagraph using Photonic Crystal

Details Achromatic Eight-octant Phase-mask Coronagraph using Photonic Crystal Achromatic Eight-octant Phase-mask Coronagraph using Photonic Crystal

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...714..772m&link_type=abstract

The Astrophysical Journal, Volume 714, Issue 1, pp. 772-777 (2010).

Astronomy and Astrophysics

Astronomy

3

Instrumentation: Miscellaneous, Methods: Laboratory, Planetary Systems, Techniques: Interferometric, Techniques: Miscellaneous, Techniques: Polarimetric

Scientific paper

We designed and manufactured a photonic-crystal mask which can be used for an achromatic eight-octant phase-mask (EOPM) coronagraph for direct detection of extrasolar planets. Laboratory experiments of the EOPM coronagraph were carried out using two laser light sources as a simulated star (wavelengths of 532 and 633 nm). As a result, we attained high extinction of the simulated starlight in both the wavelengths. Halo intensity levels of about 10-6 and 10-7 were achieved at an angular distance of 3 and 13λ/D, respectively. We also discuss several issues, such as an effect of phase aberration on the coronagraphic performance, a transmittance of the proposed EOPM, and a novel two-channel coronagraphic configuration to improve system throughput.

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