High-contrast coronagraph performance in the presence of DM actuator defects

Erkin Sidick; Stuart Shaklan; Eric Cady

doi:10.1117/12.2188183

16 September 2015 High-contrast coronagraph performance in the presence of DM actuator defects

Erkin Sidick, Stuart Shaklan, Eric Cady

Proceedings Volume 9605, Techniques and Instrumentation for Detection of Exoplanets VII; 96051Y (2015) https://doi.org/10.1117/12.2188183
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

Abstract

Deformable Mirrors (DMs) are critical elements in high contrast coronagraphs, requiring precision and stability measured in picometers to enable detection of Earth-like exoplanets. Occasionally DM actuators or their associated cables or electronics fail, requiring a wavefront control algorithm to compensate for actuators that may be displaced from their neighbors by hundreds of nanometers. We have carried out experiments on our High-Contrast Imaging Testbed (HCIT) to study the impact of failed actuators in partial fulfilment of the Terrestrial Planet Finder Coronagraph optical model validation milestone. We show that the wavefront control algorithm adapts to several broken actuators and maintains dark-hole contrast in broadband light.

Citation Download Citation

Erkin Sidick, Stuart Shaklan, and Eric Cady "High-contrast coronagraph performance in the presence of DM actuator defects", Proc. SPIE 9605, Techniques and Instrumentation for Detection of Exoplanets VII, 96051Y (16 September 2015); https://doi.org/10.1117/12.2188183

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