Abstract
This paper reports observations of Ramsey fringes on a 10.6-$\ensuremath{\mu}\mathrm{m}$ two-photon transition of ${\mathrm{SF}}_{6}.$ We used two interaction zones separated by 8 cm and observed fringes of frequency 2.3 kHz. The experimental apparatus might be adapted to increase the resolution by an order of magnitude. The present 10-$\ensuremath{\mu}\mathrm{m}$ secondary frequency standards based on the ${\mathrm{CO}}_{2}$ laser locked onto a saturated absorption resonance of ${\mathrm{OsO}}_{4}$ reach an accuracy of a few ${10}^{\ensuremath{-}13}.$ This work contributes to the current attempts to build a new generation of frequency standards with a potential accuracy in the ${10}^{\ensuremath{-}14}--{10}^{\ensuremath{-}15}$ range.
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