TPF-C Technology Plan - Exoplanet Exploration Program - NASA

Chapter 7
7.7.3 Advanced Concepts: Phase-Induced Amplitude Apodization
Scope
This work is focused on developing the mathematical formalism for this concept. This work will
contribute to the design of optical surfaces and minimization of system aberrations. A number of
implementations, including hybrid concepts, will be explored. A laboratory demonstration of
hybrid PIAA/conventional apodization approach in the visible is planned. The demonstration
includes wave-front control employing a deformable mirror, and results will be compared to
simulations. Optical fabrication issues will be addressed through this experimental effort. The
phase-induce amplitude apodization schedule is given in Table 7-22.
State of the Art TRL 2
The PIAA principal has been demonstrated in a laboratory experiment. Detailed analyses have
been published. The technique has been applied in radio dishes for decades. Optics suitable for
1e-6 diffraction control are currently being fabricated. These optics meet unique requirements for
radius-of-curvature and accuracy at the edge of the optic.
Table 7-22. Phase-Induce Amplitude Apodization Schedule
Planned
Completion
Date
Pre-Phase A
Planned Activities Performance Targets TRL
Contracts with NOAO and U
of Hawaii for analysis and
proof of concept.
10 -7 contrast at 4 λ/D 3
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