Widening the effective field of view of adaptive optics telescopes using deconvolution from wavefront sensing

Michael C. Roggemann; Brent L. Ellerbroek; Troy A. Rhoadarmer

doi:10.1117/12.176755

1 June 1994 Widening the effective field of view of adaptive optics telescopes using deconvolution from wavefront sensing

Michael C. Roggemann, Brent L. Ellerbroek, Troy A. Rhoadarmer

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Proceedings Volume 2198, Instrumentation in Astronomy VIII; (1994) https://doi.org/10.1117/12.176755
Event: 1994 Symposium on Astronomical Telescopes and Instrumentation for the 21st Century, 1994, Kailua, Kona, HI, United States

Abstract

A fundamental problem of adaptive optics systems is the very narrow corrected field-of-view (FOV) which can be obtained due to the fact that turbulence is extended in altitude throughout the atmosphere. The correctable FOV is on the order of 5 to 10 microradians in the visible. Previous concepts to broaden the corrected FOV have been hardware-oriented, requiring multiple wavefront sensors (WFS) and multiple deformable mirrors. In this paper we analyze the average performance of an image measurement and post processing technique which uses simultaneous measurements of a short exposure compensated image measured in an off-axis direction, and an additional WFS measurement taken in the off-axis direction. Results are presented for infinite altitude WFS beacons driving both the WFS for the adaptive optics and the WFS looking in the off-axis direction, a variety of seeing and WFS light level conditions, and off-axis angles from two to six times the isoplanatic angle. We find that this technique provides a significant boost in the average effective transfer function out to at least six times the isoplanatic angle.

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Michael C. Roggemann, Brent L. Ellerbroek, and Troy A. Rhoadarmer "Widening the effective field of view of adaptive optics telescopes using deconvolution from wavefront sensing", Proc. SPIE 2198, Instrumentation in Astronomy VIII, (1 June 1994); https://doi.org/10.1117/12.176755

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KEYWORDS

Optical transfer functions

Adaptive optics

Signal to noise ratio

Telescopes

Wavefront sensors

Turbulence

Actuators

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