AuthorLumbres, Jennifer Rodriguez
KeywordsArtificial Laser Guide Star
Fresnel Propagation Modeling
Wavefront Sensing and Control
AdvisorMales, Jared R.
MetadataShow full item record
PublisherThe University of Arizona.
RightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction, presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
AbstractLarge segmented aperture ground and space based telescopes are undergoing development to enable direct imaging of extrasolar planets. The ground-based GMT (Giant Magellan Telescope) is planned for first light in the mid-2020’s. Future space-based segmented aperture telescope missions, such as LUVOIR (Large UV Optical Infrared Surveyor), will have picometer-level observatory stability requirements for detecting Earth-like planets within the habitable zone. The challenges of high contrast imaging (HCI) for both ground and space applications can be met with extreme adaptive optics (ExAO), a high-order (>=1000 degrees of freedom) adaptive optics (AO) system which performs wavefront sensing and correction at high speed (>=1KHz). In this dissertation, I will describe two ExAO projects, one each for ground and space telescopes, focused on exoplanet detection using HCI. MagAO-X is an NSF-funded ExAO system for the Magellan Clay 6.5-meter telescope at Las Campanas Observatory in Chile which is helping push the limits of HCI. Additionally, MagAO-X is a pathfinder for ExAO instruments on the GMT. I constructed a comprehensive end-to-end (E2E) simulation using Fresnel propagation to characterize the static performance of MagAO-X. The E2E model utilizes both directly measured surfaces and simulated wavefront error maps based on the power spectral density models of the optical surface measurements. For space-based segmented aperture observatories, I will describe a laser guide star (LGS) companion satellite spacecraft which uses a remote beacon to increase the signal available for wavefront sensing and control (WFSC) of the primary segments to help achieve the stringent picometer-stability requirement for the primary mirror segments. I will present a segment cophasing testbed demonstration of correcting the on-axis target point spread function using WFSC on the off-axis LGS source. I will show how these projects push the limits of HCI to enable detecting earth-like exoplanets and ultimately the presence of life in the universe.
Degree ProgramGraduate College