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Waveguide image-slicers for ultrahigh resolution spectroscopy

: Beckert, E.; Strassmeier, K.G.; Woche, M.; Eberhardt, R.; Tünnermann, A.; Andersen, M.


Atad-Ettedgui, E. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Europe, Cardiff:
Advanced optical and mechanical technologies in telescopes and instrumentation : 23 - 28 June 2008, Marseille, France
Bellingham, WA: SPIE, 2008 (SPIE Proceedings 7018)
ISBN: 978-0-8194-7228-1
Paper 70182J, 8 pp.
International Conference on Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation <2008, Marseille>
Conference Paper
Fraunhofer IOF ()

Waveguide image-slicer prototypes with resolutions up to 310.000 for the fiber fed PEPSI echelle spectrograph at the LBT and single waveguide thicknesses of down to 30 pin have been manufactured. The waveguides were macroscopically prepared, stacked Lip to an order of 7 and thinned back to square stack cross sections. A high filling ratio was achieved by realizing homogenous adhesive gaps of 4.6 mu m, using index matching adhesives for TIR within the waveguides. The image-slicer stacks can be used in immersion mode and are miniaturized to be implemented in a set of Four, measurements indicate an overall efficiency of above 80% for them.