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Proceedings Paper

Low temperature GRISM direct bonding
Author(s): Gerhard Kalkowski; Gerd Harnisch; Kevin Grabowski; Tino Benkenstein; Sascha Ehrhardt; Uwe Zeitner; Stefan Risse
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Paper Abstract

For spectroscopy in space, GRISM elements –obtained by patterning gratings on a prism surface – are gaining increasing interest. Originally developed as dispersive elements for insertion into an imaging light path without deflecting the beam, they are progressively found in sophisticated multi stage dispersion optics. We report on GRISM manufacturing by joining the individual functional elements –prisms and gratings – to suitable components. Fused silica was used as glass material and the gratings were realized by e-beam lithography und dry etching. Alignment of the grating dispersion direction to the prism angle was realized by passive adjustment. Materials adapted bonds of high transmission, stiffness and strength were obtained at temperatures of about 200°C in vacuum by hydrophilic direct bonding. Examples for bonding uncoated as well as coated fused silica surfaces are given. The results illustrate the great potential of hydrophilic glass direct bonding for manufacturing transmission optics to be used under highly demanding environmental conditions, as typical in space.

Paper Details

Date Published: 2 September 2015
PDF: 9 pages
Proc. SPIE 9574, Material Technologies and Applications to Optics, Structures, Components, and Sub-Systems II, 95740K (2 September 2015); doi: 10.1117/12.2187241
Show Author Affiliations
Gerhard Kalkowski, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Gerd Harnisch, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Kevin Grabowski, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Tino Benkenstein, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Sascha Ehrhardt, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Uwe Zeitner, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Stefan Risse, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)


Published in SPIE Proceedings Vol. 9574:
Material Technologies and Applications to Optics, Structures, Components, and Sub-Systems II
Matthias Krödel; Joseph L. Robichaud; William A. Goodman, Editor(s)

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