IRAN: Interferometric Remapped Array Nulling

Polarization interferometric nulling coronagraph for high-contrast imaging.

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 10(-10) can be achieved at 5 lambda/D for a broad wa...

Interferometric array imaging in clutter

We introduce a space-time interferometric array imaging functional that provides statistically stable images in cluttered environments. We also present a resolution theory for this imaging functional that relates the space-time coherence of the data to the range and cross-range resolution of the image. Extensive numerical simulations illustrate the theory and address some implementation issues....

Linear Array Pattern Synthesis for Wide Band Sector Nulling

Interferometric array illuminator using polarized beams

A two -dimensional non-observable square array illuminator using four polarized beams from two interferometers in tandem is reported. The array pattern could be scanned over large longitudinal distances without loss of distortion. Fringe visibility of interferograms has been studied as a function of polarization of the interfering beams. The expressions for the array patterns and the fringe vis...

Terahertz imaging using an interferometric array

Most methods of imaging in the terahertz ~THz! spectral region utilize either pulsed-laser sources or require the THz generation and detection sources to be phase coherent. The application of interferometric imaging to the THz range is described. Interferometric imaging offers considerable advantages in this regard due to its ability to image with only a handful of detector elements, image many...