23 July 2008 Waveguide image-slicers for ultrahigh resolution spectroscopy
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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.
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Erik Beckert, Erik Beckert, Klaus G. Strassmeier, Klaus G. Strassmeier, Manfred Woche, Manfred Woche, Ramona Eberhardt, Ramona Eberhardt, Andreas Tünnermann, Andreas Tünnermann, Michael Andersen, Michael Andersen, } "Waveguide image-slicers for ultrahigh resolution spectroscopy", Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 70182J (23 July 2008); doi: 10.1117/12.787756; https://doi.org/10.1117/12.787756


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