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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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slide1

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

slide2

What is Adaptive Optics?

Answer:

Real-time Improvement of the Qualityof Images which

are degraded due to dynamical perturbations of the

imaging system

slide3

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

slide5

The Shack-Hartmann Wavefront Sensor

Other design principles are possible

slide6

How it looks in Reality

From the William Herschel telescope on La Palma

slide8

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.

slide9

SCAO versus MCAO

Uncorrected SCAO MCAO

slide10

How to Make it Work

  • Analytical performance evaluation
  • Confirmation by simulations
  • Lab verifications if needed
  • Optical modeling
  • “The real thing”
slide11

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

correction for atmosphere la palma 7 layer model
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

slide13

The Moon DCAO Experiment

WFS

Sci. Cam.

DM1

0 km

DM2

10 km

Tip /Tilt

Zemax Model

Celestron

slide14

Wide Field Retinal Imaging

First light very soon!

slide15

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