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Proceedings Paper

Performance scaling laws for adaptive optics systems
Author(s): Larry E. Goad
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Paper Abstract

A performance prediction model for ground-based adaptive optics systems has been developed which permits the optimization of the spatial and temporal system response at a fixed throughput. The temporal response of the system is approximated to be that of a single-pole filter with a time constant (tau) . Approximate fits to actuator influence functions are used to model the adaptive mirror response, which is included as a high-pass spatial filter of the incident wavefront. The incident wavefront is also assumed to be spatially filtered by the sampling apertures of the wavefront sensor. The computed rms deviation of the corrected wavefront is used as the system performance measure. This system performance is parameterized in terms of the throughput a2v(tau) , where a is the actuator spacing and subaperture size and v is the pseudo-wind speed characteristic of the turbulence producing the wavefront aberrations, and the ratio of the temporal and spatial sampling intervals v(tau) /a. For large aperture telescopes with D >> r0, the performance curves are found to be independent of D and the optimal spatial and temporal bandwidths may be readily selected for the desired throughput, this parameterization provides a simple means of evaluating total system performance from typical wavefront sensor noise models.

Paper Details

Date Published: 25 August 1993
PDF: 7 pages
Proc. SPIE 1920, Active and Adaptive Optical Components and Systems II, (25 August 1993); doi: 10.1117/12.152653
Show Author Affiliations
Larry E. Goad, Litton Itek Optical Systems (United States)

Published in SPIE Proceedings Vol. 1920:
Active and Adaptive Optical Components and Systems II
Mark A. Ealey, Editor(s)

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