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Characterization of the digital holographic wavefront sensor

: Marin Palomo, Pablo; Zepp, Andreas; Gladysz, Szymon

Postprint urn:nbn:de:0011-n-3197388 (7.4 MByte PDF)
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Created on: 18.12.2014

Comeron, A. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Remote Sensing of Clouds and the Atmosphere XIX and Optics in Atmospheric Propagation and Adaptive Systems XVII : 22 - 25 September 2014, Amsterdam, Netherlands
Bellingham, WA: SPIE, 2014 (Proceedings of SPIE 9242)
ISBN: 9781628413052
Paper 92421T, 14 pp.
Conference "Remote Sensing of Clouds and the Atmosphere" <19, 2014, Amsterdam>
Conference "Optics in Atmospheric Propagation and Adaptive Systems" <17, 2014, Amsterdam>
Conference Paper, Electronic Publication
Fraunhofer IOSB ()
digital holographic wavefront sensor; computer-generated hologram; spatial light modulator; adaptive optics; turbulence

Correction of atmospheric effects on the propagation of laser light can be achieved with adaptive optics (AO) by relying on adequate wavefront sensors. For free-space laser communications and for tracking of high-speed airborne objects, conventional wavefront sensing methods e.g. those based on the Shack-Hartmann sensor (SHS), are not always effective. Partial obscuration and saturation of the detector due to strong turbulence lead to errors in wavefront reconstruction. Another drawback of Shack-Hartmann wavefront-sensing is the timeconsuming readout of the whole detector and subsequent matrix-vector multiplication necessary to reconstruct the wavefront. We characterize a promising modal alternative: digital holographic wavefront sensor (DHWS).We examine the performance of the sensor for single-, and multimode operation and its dependence on the detector size, scintillation, residual tip/tilt and misalignments.