Adaptive Optics. A Short Presentation of Ongoing AO Work at Lund Observatory Mette Owner-Petersen Lund Observatory. Workshop for “Forskarskolen i Rymdteknik” Gothenburg 12/9 – 13/9 Gothenburg. What is Adaptive Optics?. Answer: Real-time Improvement of the Quality of Images which
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A Short Presentation
Ongoing AO Work
at Lund Observatory
Workshop for “Forskarskolen i Rymdteknik”
Gothenburg 12/9 – 13/9 Gothenburg
Real-time Improvement of the Qualityof Images which
are degraded due to dynamical perturbations of the
Strehl Ratio:Detection of faint objects
FWHM:Resolving bright objects in crowded fields
Contrast:Direct Exo-Planet observation
Other design principles are possible
From the William Herschel telescope on La Palma
One DM and one guide star -> High Strehl but small corrected field.
One DM and several guide stars -> Low Strehl but narrow FWHM over large field.
Several DMs and several guide stars -> High Strehl and large corrected field.
One DM and one Guide Star. Complicated filtering in both image and pupil plane
-> Extremely high contrast.
Uncorrected SCAO MCAO
PhD project for Anita Enmark
Collaboration with Dept. of Applied Optics in Galway and FOI Sweden
PhD project for Per Knutsson
Collaboration with Dept. of Ophthalmology in Gothenburg
Experimental verification of expected DCAO performance
Euro50 PSF @ λ=2.2 μm Scale 00.3
0 s < t < 0.1 s No AO correction
0.1 s < t < 0.6 s Slow correction for Focus & Tip/tilt
0.6 s < t < 1.1 s AO ON
Specification for AO: Strehl > 0.58
First light very soon!
Goal of the experiment: Emulation of K – band performance of SCAO, GLAO and DCAO on a 7.5 m telescope
5 guide stars in a cross
Field gain going from SCAO to DCAO