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All-dielectric prism-grating-prism component realized by direct hydrophilic bonding technology for optical applications in space

 
: Flügel-Paul, T.; Rothhardt, C.; Benkenstein, T.; Grabowski, K.; Risse, S.; Eberhardt, R.; Guldimann, B.; Zeitner, U.D.

:

Sodnik, Z. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
International Conference on Space Optics, ICSO 2018 : Chania, Greece, 9-12 October 2018
Bellingham, WA: SPIE, 2019 (Proceedings of SPIE 11180)
ISBN: 978-1-5106-3077-2
Paper 1118014, 10 S.
International Conference on Space Optics (ICSO) <12, 2018, Chania>
Englisch
Konferenzbeitrag
Fraunhofer IOF ()

Abstract
Here, we report on the approach of realizing an all-fused-silica PGP disperser (prism + grating + prism) by low temperature direct bonding. A surface relief grating with period 660nm and overall depth of approximately 2000nm is sandwiched between two equal prisms. Direct bonding of glass relies on the formation of covalent bonds between hydrophilic silicon-oxide surfaces. Compared to other joining technologies, like adhesive bonding or optical contacting, the established connection is stiff, shows no outgassing, is highly resistant against chemical and radiative degradation and the established optical interface is intrinsically impedance-matched. In summary, two prototypes were realized, optically characterized and successfully underwent environmental testing. The overall diffraction efficiency of the PGP is larger than 90%.

: http://publica.fraunhofer.de/dokumente/N-574661.html