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Polarization interferometric nulling coronagraph for high-contrast imaging

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Abstract

We propose a novel, high-contrast imager called a polarization interferometric nulling coronagraph (PINC) for direct detection of extrasolar planets. The PINC uses achromatic half-wave plates (HWPs) installed in a fully symmetric beam combiner based on polarizing beam splitters. Jones calculus suggests that a stellar halo suppression level of 1010 can be achieved at 5 λ/D for a broad wavelength range from 1.6 to 2.2μm by using Fresnel-rhomb HWPs made of BK7. Laboratory experiments on the PINC used two laser light sources (wavelengths of λ=532 and 671nm), and we obtained a halo suppression level of approximately 106 at 5 λ/D for both wavelengths.

© 2010 Optical Society of America

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