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Dynamic interferometric wavefront sensor for strong turbulence conditions based on polarization imaging sensor

Helde, Fabian and Buske, Ivo (2021) Dynamic interferometric wavefront sensor for strong turbulence conditions based on polarization imaging sensor. In: Proceedings of SPIE - The International Society for Optical Engineering. SPIE Remote Sensing 2021, 13.-16. Sept. 2021, Madrid, Spanien. ISSN 0277-786X.

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Adaptive Optics (AO) systems for the compensation of optical turbulence in the atmosphere have been proven to work well within certain boundaries. Under strong turbulence conditions, AO based on conventional gradient wavefront sensors such as the Shack-Hartmann combined with linear least-squares reconstructors have shown to perform poorly due to the occurrence of phase singularities, that inherently cannot be reconstructed by the least-squares method. Directwavefront sensors, measuring phase differences directly rather than the gradient, avoid this problem of reconstruction. The self-referencing point-diffraction interferometer, a concept for direct-wavefront sensing that relies on the principle of spatial filtering to generate a (theoretically) unaberrated reference wave from the incoming aberrated wavefront, was early identified as a strong contender for an advanced wavefront sensor in strong turbulence conditions. Several authors have presented such systems. They make use of either the Fourier-transform method or instantaneous phase-shifted interferograms imaged by a complex optical set-up on a single image sensor. This paper evaluates a dynamic selfreferencing point-diffraction interferometer based on a pixelated polarization filter array imaging sensor for instantaneous spatial phase-shifting, promising a simpler optical set-up than other instantaneous phase-shifting approaches while retaining the advantage of less computational requirement compared with Fourier-transform methods.

Item URL in elib:https://elib.dlr.de/147013/
Document Type:Conference or Workshop Item (Speech)
Title:Dynamic interferometric wavefront sensor for strong turbulence conditions based on polarization imaging sensor
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Helde, FabianF.Helde (at) dlr.deUNSPECIFIED
Buske, IvoIvo.Buske (at) dlr.deUNSPECIFIED
Date:September 2021
Journal or Publication Title:Proceedings of SPIE - The International Society for Optical Engineering
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:optical turbulence, dynamic interferometry, instantaneous single-shot interferometry, phase shifting interferometry, self-referencing point diffraction interferometry, wavefront sensing, laser beam propagation, pixelated filter array, spatial light modulator
Event Title:SPIE Remote Sensing 2021
Event Location:Madrid, Spanien
Event Type:international Conference
Event Dates:13.-16. Sept. 2021
HGF - Research field:other
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L DT - Defense Technology
DLR - Research theme (Project):L - Effect
Location: Stuttgart
Institutes and Institutions:Institute of Technical Physics > Active Optical Systems
Deposited By: Buske, Dr.-Ing. Ivo
Deposited On:15 Dec 2021 10:25
Last Modified:15 Dec 2021 10:25

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