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Proceedings Paper

Waveguide image-slicers for ultrahigh resolution spectroscopy
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Paper Abstract

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 μm have been manufactured. The waveguides were macroscopically prepared, stacked up 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 μm, 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.

Paper Details

Date Published: 23 July 2008
PDF: 8 pages
Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 70182J (23 July 2008); doi: 10.1117/12.787756
Show Author Affiliations
Erik Beckert, Fraunhofer-Institute for Applied Optics and Precision Engineering (Germany)
Klaus G. Strassmeier, Astrophysical Institute Potsdam (Germany)
Manfred Woche, Astrophysical Institute Potsdam (Germany)
Ramona Eberhardt, Fraunhofer-Institute for Applied Optics and Precision Engineering (Germany)
Andreas Tünnermann, Fraunhofer-Institute for Applied Optics and Precision Engineering (Germany)
Michael Andersen, Univ. of Copenhagen (Denmark)


Published in SPIE Proceedings Vol. 7018:
Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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