Achromatic Optics for Phase Apodization Coronagraphy


Johanan L. Codona (1), Matthew A. Kenworthy (1,2)


(1) The Univ. of Arizona, United States; (2) Leiden Observatory, The Netherlands


Phase Apodization Coronagraphy (PAC) uses a pupil phase pattern to suppress the diffraction halo over some region around a star. Since the halo suppression requires a particular phase pattern be present and phase is inherently wavelength-dependent, PAC suppression is normally chromatic. We discuss the suppression bandwidth of a PAC implemented with a mirror or a single-component apodizing phase plate (APP) transmission optic. We then consider achromatic APP designs made possible by the use of two materials and the expected benefits. We present a design for a high-throughput achromatized APP for the LBT LMIRCam that is optimized for the direct imaging of cool extrasolar giant planets around nearby stars at thermal infrared wavelengths.

Attached documents

Lyot2010proc s8 talk CodonaJ.pdf
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