
Proceedings Paper
Impact of branch points in adaptive optics compensation of thermal blooming and turbulenceFormat | Member Price | Non-Member Price |
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Paper Abstract
Adaptive optics (AO) can be used to mitigate turbulence; however, when a single deformable mirror is used for phaseonly
compensation of thermal blooming, analysis predicts the possibility of instability. This instability is appropriately
termed phase compensation instability (PCI) and arises with the time-dependent development of spatial perturbations
found within the high-energy laser (HEL) beam. These spatial perturbations act as local hot spots that produce negativelens-
like optical effects in the atmosphere. An AO system corrects for the hot spots by applying positive-lens-like phase
compensations. In turn, this increases the strength of the thermal blooming and leads to a runaway condition, i.e.,
positive feedback, in the AO control loop. This study uses computational wave-optics simulations to model horizontal
propagation with the effects of thermal blooming and turbulence for a focused Gaussian HEL beam. A point-source
beacon and nominal AO system are used for phase compensation. Previous results show that a high number of branch
points limit the development of PCI for phase compensation of only thermal blooming. For phase compensation of
thermal blooming and turbulence, the number of branch points decreases and system performance is reduced. A series
of computational wave-optics experiments are presented which explore the possibility for PCI.
Paper Details
Date Published: 13 September 2011
PDF: 10 pages
Proc. SPIE 8165, Unconventional Imaging, Wavefront Sensing, and Adaptive Coded Aperture Imaging and Non-Imaging Sensor Systems, 816503 (13 September 2011); doi: 10.1117/12.894079
Published in SPIE Proceedings Vol. 8165:
Unconventional Imaging, Wavefront Sensing, and Adaptive Coded Aperture Imaging and Non-Imaging Sensor Systems
Stanley Rogers; Jean J. Dolne; David P. Casasent; Thomas J. Karr; Victor L. Gamiz, Editor(s)
PDF: 10 pages
Proc. SPIE 8165, Unconventional Imaging, Wavefront Sensing, and Adaptive Coded Aperture Imaging and Non-Imaging Sensor Systems, 816503 (13 September 2011); doi: 10.1117/12.894079
Show Author Affiliations
Mark F. Spencer, Air Force Institute of Technology (United States)
Salvatore J. Cusumano, Air Force Institute of Technology (United States)
Published in SPIE Proceedings Vol. 8165:
Unconventional Imaging, Wavefront Sensing, and Adaptive Coded Aperture Imaging and Non-Imaging Sensor Systems
Stanley Rogers; Jean J. Dolne; David P. Casasent; Thomas J. Karr; Victor L. Gamiz, Editor(s)
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