Wavefront sensor-driven variable-geometry pupil for ground-based aperture synthesis imaging

David W. Tyler

doi:10.1117/12.390363

7 July 2000 Wavefront sensor-driven variable-geometry pupil for ground-based aperture synthesis imaging

David W. Tyler

Proceedings Volume 4007, Adaptive Optical Systems Technology; (2000) https://doi.org/10.1117/12.390363
Event: Astronomical Telescopes and Instrumentation, 2000, Munich, Germany

Abstract

I describe a variable-geometry pupil (VGP) to increase image resolution for ground-based near-IR and optical imaging. In this scheme, a curvature-type wavefront sensor provides an estimate of the wavefront curvature to the controller of a high-resolution spatial light modulator (SLM) or micro- electromechanical (MEM) mirror, positioned at an image of the telescope pupil. This optical element, the VGP, passes or reflects the incident beam only where the wavefront phase is sufficiently smooth, viz., where the curvature is sufficiently low. Using a computer simulation, I show the VGP can sharpen and smooth the long-exposure PSF and increase the OTF SNR for tilt-only and low-order AO systems, allowing higher resolution and more stable deconvolution with dimmer AO guidestars.

Citation Download Citation

David W. Tyler "Wavefront sensor-driven variable-geometry pupil for ground-based aperture synthesis imaging", Proc. SPIE 4007, Adaptive Optical Systems Technology, (7 July 2000); https://doi.org/10.1117/12.390363

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KEYWORDS

Adaptive optics

Signal to noise ratio

Point spread functions

Wavefronts

Telescopes

Sensors

Wavefront sensors

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