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

Nazim Ali Bharmal; David Bramall; Ariadna Calcines; Timothy Morris; Jürgen Schmoll; Lazar Staykov

doi:10.1117/12.2629888

29 August 2022 WIVERN: a laboratory experiment for testing novel laser-based wavefront sensing techniques

Nazim Ali Bharmal, David Bramall, Ariadna Calcines, Timothy Morris, Jürgen Schmoll, Lazar Staykov

Proceedings Volume 12185, Adaptive Optics Systems VIII; 121856D (2022) https://doi.org/10.1117/12.2629888
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

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 Download Citation

Nazim Ali Bharmal, David Bramall, Ariadna Calcines, Timothy Morris, Jürgen Schmoll, and Lazar Staykov "WIVERN: a laboratory experiment for testing novel laser-based wavefront sensing techniques", Proc. SPIE 12185, Adaptive Optics Systems VIII, 121856D (29 August 2022); https://doi.org/10.1117/12.2629888

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