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The Adaptive Optics Lucky Imager High-resolution imaging in the visible on large ground-based telescopes Jonathan Crass Institute of Astronomy, University.

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Presentation on theme: "The Adaptive Optics Lucky Imager High-resolution imaging in the visible on large ground-based telescopes Jonathan Crass Institute of Astronomy, University."— Presentation transcript:

1 The Adaptive Optics Lucky Imager High-resolution imaging in the visible on large ground-based telescopes Jonathan Crass Institute of Astronomy, University of Cambridge SPIE Astronomical Telescopes and InstrumentationJune 2014, Montreal Craig Mackay, Rafael Rebolo-López, David King, Victor González Escalera, Marta Puga Antolín, Antonio Pérez Garrido, Lucas Labadie, Roberto López, Alex Oscoz, Jorge Andrés Pérez Prieto, Luis Rodríguez-Ramos, Sergio Velasco, Isidro Villo

2 Jonathan Crass - High-resolution imaging in the visible on large ground-based telescopes Motivation and background The Adaptive Optics Lucky Imager AO and lucky imaging systems Optical design & systems On-sky results Future work Outline

3 Jonathan Crass - High-resolution imaging in the visible on large ground-based telescopes How to get diffraction limited imaging in the optical? Adaptive optics It’s hard to do AO at optical wavelengths Lucky imaging Only works on telescopes up ~2.5m in diameter Combine the two together – diffraction limited imaging in the visible Motivation

4 Jonathan Crass - High-resolution imaging in the visible on large ground-based telescopes Adaptive Optics and Lucky Imaging HST - ACSLucky – 10%Fourier – 20%Fourier – 50%

5 Jonathan Crass - High-resolution imaging in the visible on large ground-based telescopes The sharpest images come from the smallest fraction of images. Often the poorer quality images are only smeared in one direction. Garrel et al (PASP, 2012) suggested making the lucky selection in Fourier space rather than image space. High-Efficiency Lucky Imaging

6 Jonathan Crass - High-resolution imaging in the visible on large ground-based telescopes High-Efficiency Lucky Imaging High-efficiency lucky imaging Mackay 2013, MNRAS, 432, 702

7 Jonathan Crass - High-resolution imaging in the visible on large ground-based telescopes Initially for the 4.2m William Herschel Telescope Lucky Imaging based science instrument: 4 × 1024 square EMCCDs (E2V CCD201) providing 2000×2000px imaging region Pixel scale of milliarcseconds in I-band Field of view ranging from 37.5 to arcseconds AO component: ALPAO 241 actuator deformable mirror (DM241-25) Non-linear curvature wavefront sensor Comprises 2 EMCCDs About AOLI

8 Jonathan Crass - High-resolution imaging in the visible on large ground-based telescopes Non-linear Curvature Wavefront Sensor nlCWFS offers: High sensitivity to low and high orders Reconstruction with ≈ fewer photons than conventional techniques Talk – Friday 11:05am (Jonathan Crass) The AOLI low-order non-linear curvature wavefront sensor: laboratory and on-sky results

9 Jonathan Crass - High-resolution imaging in the visible on large ground-based telescopes AOLI Optics

10 Jonathan Crass - High-resolution imaging in the visible on large ground-based telescopes Wavefront sensor layout

11 Jonathan Crass - High-resolution imaging in the visible on large ground-based telescopes Science Camera

12 Jonathan Crass - High-resolution imaging in the visible on large ground-based telescopes Calibration System Poster – Wednesday (Marta Puga Antolín) An atmospheric turbulence and telescope simulator for the development of AOLI

13 Jonathan Crass - High-resolution imaging in the visible on large ground-based telescopes AOLI at the WHT The initial run had four key aims: 1.To collect data from the nlCWFS for post-processing analysis and reconstruction. 2.To collect data using the science camera to verify its optical quality and sensitivity. 3.To collect synchronised data between the nlCWFS and science camera to allow comparison between reconstructed wavefronts and the science image. 4.To collect data with the calibration system to verify its characteristics against on-sky data.

14 Jonathan Crass - High-resolution imaging in the visible on large ground-based telescopes AOLI at the WHT

15 Jonathan Crass - High-resolution imaging in the visible on large ground-based telescopes AOLI at the WHT

16 Jonathan Crass - High-resolution imaging in the visible on large ground-based telescopes On-sky data

17 Jonathan Crass - High-resolution imaging in the visible on large ground-based telescopes On-sky data: Real-time lucky

18 Jonathan Crass - High-resolution imaging in the visible on large ground-based telescopes On-sky data: Post processing Velasco et al., 2014, MNRAS (In Prep)

19 Jonathan Crass - High-resolution imaging in the visible on large ground-based telescopes Summary The combination of AO and lucky imaging allows diffraction limited imaging in the visible. The AOLI science camera data matches well with design specification. Issues experienced on first on-sky run identified and solutions implemented or proposed. Summary & Future Work Future Work Redesign of some mechanisms and supports within instrument to improve performance. Fully develop AO system to provide diffraction limited imaging at the WHT. AOLI has the potential to feed not only an imaging camera but also an integral field spectrograph or other instruments. Aim to revisit the WHT in 2015.


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