TY - GEN
T1 - High performance curvature wavefront sensing for extreme-AO
AU - Guyon, Olivier
PY - 2007
Y1 - 2007
N2 - Despite promising results,1,2 Curvature wavefront sensing is usually not considered as an option for future AO systems such as AO systems for Extremely Large Telescopes (ELTs) or high order systems for the current generation of 8 to 10m telescopes. CWFS is generally thought to be useful only for low order systems, both for technical reasons (detector and DM technology) and fundamental reasons (noise propagation for high order curvature systems). I show in this paper that these worries are unjustified, and that, thanks to newly developed techniques and algorithms, CWFS is in fact much superior to more traditional Shack-Hartman wavefront sensing: (1) CWFS can be made extremely efficient, even for a high order system, thanks to a new "multi- stroke" curvature wavefront sensing mode (2) CWFS-based systems can efficiently utilize both piezo-stack type deformable mirrors and square pixel detector array, and there is therefore no reason to think that technological considerations limit CWFS-based systems to low-order correction (3) non-linear Fourier-based CWFS control algorithms can dramatically increase the performance of existing and future CWFS-based systems.
AB - Despite promising results,1,2 Curvature wavefront sensing is usually not considered as an option for future AO systems such as AO systems for Extremely Large Telescopes (ELTs) or high order systems for the current generation of 8 to 10m telescopes. CWFS is generally thought to be useful only for low order systems, both for technical reasons (detector and DM technology) and fundamental reasons (noise propagation for high order curvature systems). I show in this paper that these worries are unjustified, and that, thanks to newly developed techniques and algorithms, CWFS is in fact much superior to more traditional Shack-Hartman wavefront sensing: (1) CWFS can be made extremely efficient, even for a high order system, thanks to a new "multi- stroke" curvature wavefront sensing mode (2) CWFS-based systems can efficiently utilize both piezo-stack type deformable mirrors and square pixel detector array, and there is therefore no reason to think that technological considerations limit CWFS-based systems to low-order correction (3) non-linear Fourier-based CWFS control algorithms can dramatically increase the performance of existing and future CWFS-based systems.
KW - Adaptive optics
UR - http://www.scopus.com/inward/record.url?scp=42249092830&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=42249092830&partnerID=8YFLogxK
U2 - 10.1117/12.735155
DO - 10.1117/12.735155
M3 - Conference contribution
AN - SCOPUS:42249092830
SN - 9780819468390
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Astronomical Adaptive Optics Systems and Applications III
T2 - Astronomical Adaptive Optics Systems and Applications III
Y2 - 29 August 2007 through 30 August 2007
ER -