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15x optical zoom and extreme optical image stabilisation: diffraction limited integral field spectroscopy with the Oxford SWIFT spectrograph

Tecza, Matthias and Thatte, Niranjan and Clarke, Fraser and Lynn, James and Freeman, David and Roberts, Jennifer and Dekany, Richard (2012) 15x optical zoom and extreme optical image stabilisation: diffraction limited integral field spectroscopy with the Oxford SWIFT spectrograph. In: Ground-based and Airborne Instrumentation for Astronomy IV. Proceedings of SPIE. No.8446. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, p. 844622. ISBN 978-0-8194-9147-3. https://resolver.caltech.edu/CaltechAUTHORS:20161027-104029666

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Abstract

When commissioned in November 2008 at the Palomar 200 inch Hale Telescope, the Oxford SWIFT I and z band integral field spectrograph, fed by the adaptive optics system PALAO, provided a wide (3×) range of spatial resolutions: three plate scales of 235 mas, 160 mas, and 80 mas per spaxel over a contiguous field-of-view of 89×44 pixels. Depending on observing conditions and guide star brightness we can choose a seeing limited scale of 235 mas per spaxel, or 160 mas and 80 mas per spaxel for very bright guide star AO with substantial increase of enclosed energy. Over the last two years PALAO was upgraded to PALM-3000: an extreme, high-order adaptive optics system with two deformable mirrors with more than 3000 actuators, promising diffraction limited performance in SWIFT's wavelength range. In order to take advantage of this increased spatial resolution we upgraded SWIFT with new pre-optics allowing us to spatially Nyquist sample the diffraction limited PALM-3000 point spread function with 16 mas resolution, reducing the spaxel scale by another factor of 5×. We designed, manufactured, integrated and tested the new pre-optics in the first half of 2011 and commissioned it in December 2011. Here we present the opto-mechanical design and assembly of the new scale changing optics, as well as laboratory and on-sky commissioning results. In optimal observing conditions we achieve substantial Strehl ratios, delivering the near diffraction limited spatial resolution in the I and z bands.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1117/12.925328DOIArticle
http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1362426PublisherArticle
Additional Information:© 2012 Society of Photo-Optical Instrumentation Engineers (SPIE). The SWIFT team would like to express their sincere gratitude to the Palomar Observatory staff and the PALM-3000 team, in particular Jean Mueller, Kevin Rykoski, Jenny Roberts, Rick Burruss and Rich Dekaney for their generous help during the installation, commissioning and subsequent operations of the SWIFT/PALM-3000. Based on observations obtained at the Hale Telescope, Palomar Observatory, as part of a collaborative agreement between the California Institute of Technology, its divisions Caltech Optical Observatories and the Jet Propulsion Laboratory (operated for NASA), and Cornell University.
Subject Keywords:integral field, image slicer, spectrograph, extreme adaptive optics, diffraction limited, fully depleted CCD
Series Name:Proceedings of SPIE
Issue or Number:8446
Record Number:CaltechAUTHORS:20161027-104029666
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20161027-104029666
Official Citation:Matthias Tecza ; Niranjan Thatte ; Fraser Clarke ; James Lynn ; David Freeman ; Jennifer Roberts ; Richard Dekany; 15x optical zoom and extreme optical image stabilisation: diffraction limited integral field spectroscopy with the Oxford SWIFT spectrograph. Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 844622 (September 24, 2012); doi:10.1117/12.925328.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:71538
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:27 Oct 2016 18:22
Last Modified:03 Oct 2019 16:08

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