Effects of optical-density and phase dispersion of an imperfect band-limited occulting mask on the broadband performance of a TPF coronagraph

Erkin Sidick; Kunjithapatham Balasubramanian

doi:10.1117/12.731678

19 September 2007 Effects of optical-density and phase dispersion of an imperfect band-limited occulting mask on the broadband performance of a TPF coronagraph

Erkin Sidick, Kunjithapatham Balasubramanian

Author Affiliations +

Proceedings Volume 6693, Techniques and Instrumentation for Detection of Exoplanets III; 66931C (2007) https://doi.org/10.1117/12.731678
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

Abstract

Practical image-plane occulting masks required by high-contrast imaging systems such as the TPF-Coronagraph introduce phase errors into the transmitting beam, or, equivalently, diffract the residual starlight into the area of the final image plane used for detecting exo-planets. Our group at JPL has recently proposed spatially profiled metal masks that can be designed to have zero parasitic phases at the center wavelength of the incoming broadband light with small amounts of OD and phase dispersions at other wavelengths. Work is currently underway to design, fabricate and characterize such image-plane masks. In order to gain some understanding on the behaviors of these new imperfect band-limited occulting masks and clarify how such masks utilizing different metals or alloys compare with each other, we carried out some modeling and simulations on the contrast performance of the high-contrast imaging testbed (HCIT) at JPL. In this paper we describe the details of our simulations and present our results.

Citation Download Citation

Erkin Sidick and Kunjithapatham Balasubramanian "Effects of optical-density and phase dispersion of an imperfect band-limited occulting mask on the broadband performance of a TPF coronagraph", Proc. SPIE 6693, Techniques and Instrumentation for Detection of Exoplanets III, 66931C (19 September 2007); https://doi.org/10.1117/12.731678

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