Dr. Nikolaos Galiatsatos Profile

Dr. Nikolaos Galiatsatos

Senior Research Associate at Durham Univ

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Proceedings Article | 13 September 2012 Paper

CEOI microslice spectrograph

Robert Content, Simon Blake, Colin Dunlop, David Nandi, Ray Sharples, Gordon Talbot, Tom Shanks, Danny Donoghue, Nikolaos Galiatsatos, Peter Luke

Proceedings Volume 8450, 84501P (2012) https://doi.org/10.1117/12.927267

KEYWORDS: Sensors, Spectrographs, Microlens array, Cameras, Space telescopes, Telescopes, Point spread functions, Single photon emission computed tomography, Prototyping, Microlens

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We developed the technology of microslice integral field units some years ago as the next step in SAURON type microlens IFU design with typically 5 times more spatial elements (spaxels) for the same spectrograph and spectral length aiming at 1,000,000 spaxels IFUs. A full instrument for laboratory demonstration composed of the fore-optics, the IFU, the spectrograph and the detector has now been built and tested. It has about 10,000 spatial elements and spectra 150 pixel long. Our IFU has 5 cylindrical microlens arrays along the optical axis as opposed to one hexagonal array in the previous design. Instead of imaging pupils on the spectrograph input focal plane, our IFU images short slitlets 17 pixel long that keep the spatial information along the spatial direction then giving 17 spaxels per slitlet instead of one in pupil imaging. This removes most of the lost space between spectra leaving place for more and keeps the spatial information over the element size while pupil images lose it. The fore-optics re-images the field on the input of the IFU. They are made of cylindrical optics to get the desired different magnifications in both directions. All the optics and detector fit in a cylinder 35 mm in diameter and 280 mm long. With a different set of fore-optics on a 4-m telescope, a field of 43" x 6.7" with spatial elements of 0.14" x 0.22" could be observed so 12 of these mini-spectrographs would cover a field surface area of about 1 arcmin² and 120,000 spaxels.

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