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9 results on '"Straessle, Rahel"'

4. NEMS based tools for nanoscience and atomic clocks

Author

de Rooij, N.F., primary, Gautsch, S., additional, Akiyama, T., additional, Loizeau, F., additional, Mileti, G., additional, Petremand, Yves, additional, Staufer, U., additional, Straessle, Rahel, additional, and Yoshikawa, G., additional

Published
2012
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7. Wall-Coated Cells for Rb Atomic Clocks: Study of the Ripening Process by Double-Resonance Spectroscopy

Author

Pellaton Matthieu, Affolderbach Christoph, Mileti Gaetano, Straessle Rahel, Briand Danick, and de Rooij Nicolas F.

Abstract

We present a study of our in house made tetracontane wall coated 87Rb vapour cells for rubidium atomic clock applications. Evolution of the double resonance (DR) signal during the so called ripening process of these cells is measured and interpreted. Intrinsic properties of the coated cells post ripening are presented. Intrinsic linewidths below 70 Hz and moderate temperature coefficients (1.5 x 10^ 10 /K) are promising cell properties in view of highly compact and miniature atomic clocks.

Published
2012

8. Evaluation of Thin Film Indium Bonding at Wafer Level.

Author

Straessle, Rahel, Pétremand, Yves, Briand, Danick, and de Rooij, Nico F.

Abstract

Abstract: We propose a thin film indium thermocompression bonding for which neither flux nor reducing atmosphere is needed. By an optimized patterning of the evaporated indium film and the lid, surface hermetic bonding on wafer level is reached without exceeding 140°C in any step of the procedure. Different designs of the indium metallization and lid were tested to improve bond strength while keeping the same bonding parameters. By depositing an adhesion layer of CrAu on the lid, the bond strength can be increased by 30% compared to the one of indium to glass bonding. Another way to increase bond strength by 40% is to profile one bonding surface in such a way that the indium oxide breaks at multiple places within the deposited area. Hermeticity is proven for all different designs. [Copyright &y& Elsevier]

Published
2012
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