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Wavefront Amplitude Variation of TPF's High Contrast Imaging Testbed: Modeling and Experiment

By John T. Trauger, Dwight C. Moody, Fang Shi, Andrew E. Lowman and Albert F. Niessner


Knowledge of wavefront amplitude is as important as the knowledge of phase for a coronagraphic high contrast imaging system. Efforts have been made to understand various contributions of the amplitude variation in Terrestrial Planet Finder's (TPF) High Contrast Imaging Testbed (HCIT). Modeling of HCIT with as-built mirror surfaces has shown an amplitude variation of 1.3% due to the phase-amplitude mixing for the testbed's front-end optics. Experimental measurements on the testbed have shown the amplitude variation is about 2.5% with the testbed's illumination pattern has a major contribution as the low order amplitude variation

Topics: Optics
Year: 2005
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