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WIVERN: a laboratory experiment for testing novel laser-based wavefront sensing techniques

Bharmal, Nazim A. and Bramall, David and Calcines Rosario, Ariadna Z. and Morris, Timothy J. and Schmoll, Jürgen and Staykov, Lazar (2022) 'WIVERN: a laboratory experiment for testing novel laser-based wavefront sensing techniques.', in Proceedings Volume 12185, Adaptive Optics Systems VIII; SPIE Astronomical Telescopes + Instrumentation. .


WIVERN is a testbed for laboratory experiments in laser-based wavefront sensing. It emulates laser uplink from a 4m telescope with 1.6 arcsec seeing and laser back-scattering from up to 20 km. Currently there are three current wavefront sensing capabilities. The first two are from a wide-field of view (1.0 arcmin) Shack Hartmann wavefront sensor observing a constellation of point sources at infinity (reference targets, star-oriented wavefront sensing), or an image from emulated back-scattering (wide-field correlation wavefront sensing). The third is based on the PPPP concept. Other sub-systems are laser projection replicating a pupil launch, a 7x7 pupil-conjugate deformable mirror (DM), and a wide-field camera for PSF analysis. A 500 Hz rate accumulates sufficient data for statistical and machine-learning analysis over hour timescales. It is a compact design (2.1m2) with mostly commercial dioptric components. The sub-system optical interfaces are identical: a flat focal plane for easy bench reconfiguration. The end-to-end design is diffraction-limited with ≤ 1% pupil distortion for wavelengths λ=633–750 nm.

Item Type:Book chapter
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Publisher statement:Copyright (2022) Society of Photo‑Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this publication for a fee or for commercial purposes, and modification of the contents of the publication are prohibited.
Date accepted:No date available
Date deposited:29 September 2022
Date of first online publication:29 August 2022
Date first made open access:29 September 2022

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