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

Bharmal, Nazim A.; Bramall, David; Calcines Rosario, Ariadna Z.; Morris, Timothy J.; Schmoll, Jürgen; Staykov, Lazar; Schreiber, Laura; Schmidt, Dirk; Vernet, Elise

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


Authors

Laura Schreiber

Dirk Schmidt

Elise Vernet



Abstract

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.

Citation

Bharmal, N. A., Bramall, D., Calcines Rosario, A. Z., Morris, T. J., Schmoll, J., Staykov, L., …Vernet, E. (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. https://doi.org/10.1117/12.2629888

Conference Name Adaptive Optics Systems VIII
Online Publication Date Aug 29, 2022
Publication Date 2022
Deposit Date Sep 29, 2022
Publicly Available Date Sep 29, 2022
Publisher SPIE
Book Title Proceedings Volume 12185, Adaptive Optics Systems VIII; SPIE Astronomical Telescopes + Instrumentation
ISBN 9781510653511
DOI https://doi.org/10.1117/12.2629888

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Copyright 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.







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