The Phase-Induced Amplitude Apodization Coronagraph (PIAAC): Results of Numerical Simulations and Laboratory Experiments

Details The Phase-Induced Amplitude Apodization Coronagraph (PIAAC): Results of Numerical Simulations and Laboratory Experiments The Phase-Induced Amplitude Apodization Coronagraph (PIAAC): Results of Numerical Simulations and Laboratory Experiments

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20513503p&link_type=abstract

American Astronomical Society Meeting 205, #135.03; Bulletin of the American Astronomical Society, Vol. 36, p.1564

Physics

Optics

Scientific paper

The main goal of the Terrestrial Planet Finder mission (NASA) is to find and characterize Earth-like planets around the nearest stars. But detection of such planets is difficult because of the high contrast (typically 1010)and small angular separation (typically 50 mas) between the planet and its parent star. Therefore, exoplanet imaging requires the use of a coronagraphic device. The Phase-Induced Amplitude Apodization Coronagraph (PIAAC), which relies on a lossless apodization technique, seems especially adapted to this task.
We show how the 3D shape of the optics of the PIAAC can be computed using geometrical optics laws. We have successfully produced apodizing lenses and demonstrated lossless beam apodization in the lab. In the next phase of our laboratory experiment effort, high quality mirrors will be combined with wavefront control to demonstrate achromatic high contrast imaging (106 or more) at small angular separation (less than 2λ /D).
We show how the 3D shape of the optics of the PIAAC can be computed using geometrical optics laws. We have successfully produced apodizing lenses and demonstrated lossless beam apodization in the lab. In the next phase of our laboratory experiment effort, high quality mirrors will be combined with wavefront control to demonstrate achromatic high contrast imaging (106 or more) at small angular separation (less than 2λ /D).
Through numerical simulations, including 3D raytracing, we have characterized the performance of the PIAAC and its sensitivity to wavefront errors. We have also verified that the PIAAC delivers a clean PSF in a moderately wide (more than 200λ /D in diameter) field of view.

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