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A Short Presentation of Ongoing AO Work at Lund Observatory Mette Owner-Petersen

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 of Ongoing AO Work at Lund Observatory Mette Owner-Petersen

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  1. 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

  2. What is Adaptive Optics? Answer: Real-time Improvement of the Qualityof Images which are degraded due to dynamical perturbations of the imaging system

  3. What is Meant by Image Quality? • Peak Intensity (Strehl Ratio) • Resolution (FWHM) • Contrast (Background Level) Point Image (PSF) Strehl Ratio:Detection of faint objects FWHM:Resolving bright objects in crowded fields Contrast:Direct Exo-Planet observation

  4. A Generic Example of Adaptive Optics

  5. The Shack-Hartmann Wavefront Sensor Other design principles are possible

  6. How it looks in Reality From the William Herschel telescope on La Palma

  7. With and Without Adaptive Optics

  8. Different AO Modes • Single Conjugate Adaptive Optics (SCAO). One DM and one guide star -> High Strehl but small corrected field. • Ground Layer Adaptive Optics (GLAO). The easy game. One DM and several guide stars -> Low Strehl but narrow FWHM over large field. • Multi Conjugate Adaptive Optics (MCAO). Several DMs and several guide stars -> High Strehl and large corrected field. • Extreme Adaptive Optics (ExAO). The hard bargain One DM and one Guide Star. Complicated filtering in both image and pupil plane -> Extremely high contrast.

  9. SCAO versus MCAO Uncorrected SCAO MCAO

  10. How to Make it Work • Analytical performance evaluation • Confirmation by simulations • Lab verifications if needed • Optical modeling • “The real thing”

  11. Ongoing AO Work • Simulations of AO perfomance for the Euro50. Integrated modeling PhD project for Anita Enmark • DCAO on the Lunda – Moon and for terrestrial applications Collaboration with Dept. of Applied Optics in Galway and FOI Sweden PhD project for Per Knutsson • DCAO for wide - field retinal imaging Collaboration with Dept. of Ophthalmology in Gothenburg • Previous:Analytical performance evaluations Experimental verification of expected DCAO performance

  12. Correction for AtmosphereLa Palma 7-Layer Model Euro50 PSF @ λ=2.2 μm Scale 00.3 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

  13. The Moon DCAO Experiment WFS Sci. Cam. DM1 0 km DM2 10 km Tip /Tilt Zemax Model Celestron

  14. Wide Field Retinal Imaging First light very soon!

  15. The Lund DCAO Demonstrator 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 Specific Address: Field gain going from SCAO to DCAO

  16. The Lund DCAO Demonstrator

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