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Multi-resolution waveguide image slicer for the PEPSI instrument

: Beckert, E.; Strassmeier, K.G.; Woche, M.; Harnisch, G.; Hornaff, M.; Weber, M.; Barnes, S.


Navarro, R. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II : 26 June-1 July 2016, Edinburgh, United Kingdom
Bellingham, WA: SPIE, 2016 (Proceedings of SPIE 9912)
ISBN: 978-1-5106-0203-8
ISBN: 978-1-5106-0204-5
Paper 99125O, 7 S.
Conference "Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation" <2, 2016, Edinburgh>
Fraunhofer IOF ()

A waveguide image slicer with resolutions up to 270.000 (planned: 300.000) for the fiber fed PEPSI echelle spectrograph at the LBT and single waveguide thicknesses of down to 70 μm has been manufactured and tested. The waveguides were macroscopically prepared, stacked up to an order of seven and thinned back to square stack cross sections. A high filling ratio was achieved by realizing homogenous adhesive gaps of 3.6 μm, using index matching adhesives for TIR within the waveguides. The image slicer stacks are used in immersion mode and are miniaturized to enable implementation in a set of 2x8. The overall efficiency is between 92 % and 96 %.