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 Instrumentation June 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
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High-resolution imaging in the visible on large ground-based telescopes
High-resolution imaging in the visible on large ground-based telescopes. The Adaptive Optics Lucky Imager. Jonathan Crass Institute of Astronomy, University of Cambridge. - PowerPoint PPT Presentation
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The Adaptive Optics Lucky Imager
High-resolution imaging in the visible on large ground-based telescopes
Jonathan CrassInstitute of Astronomy, University of Cambridge
SPIE Astronomical Telescopes and Instrumentation June 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
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
Jonathan Crass - High-resolution imaging in the visible on large ground-based telescopes
How to get diffraction limited imaging in the optical?
Adaptive opticsIt’s hard to do AO at optical wavelengths
Lucky imagingOnly works on telescopes up ~2.5m in diameter
Combine the two together – diffraction limited imaging in the visible
Motivation
Jonathan Crass - High-resolution imaging in the visible on large ground-based telescopes
Adaptive Optics and Lucky Imaging
HST - ACS Lucky – 10% Fourier – 20% Fourier – 50%
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
Jonathan Crass - High-resolution imaging in the visible on large ground-based telescopes
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 18-55 milliarcseconds in I-band• Field of view ranging from 37.5 to 112.5 arcseconds• AO component:• ALPAO 241 actuator deformable mirror (DM241-25)• Non-linear curvature wavefront sensor• Comprises 2 EMCCDs
About AOLI
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 ≈100-1000 fewer photons than