The only technology to provide a relative frequency stability better than 1x10-15 for integration times ranging from 1 s to 104 s (about 6x10-15 on the day). Uliss does not require the boring and especially expensive use of liquid helium, our technology is able to answering the most demanding applications.

What's new?


10th to 12th April 2018

32nd European Frequency and Time Forum takes place in Torino. Uliss team contributes to a presentation entitled "Direct Measurement of Cryogenic Sapphire Oscillators with Tracking DDSs and Two-Sample Covariance".

10th to 13th July, 2017

EFTF-IFCS joint conference takes place in Besançon. Take advantage to come and see ULISS in situ. You can contact us now or meet us at the conference.

December, 2016

Uliss is now able to deliver a low power version of the CSO (see datasheet).

February, 2015

Uliss moved to the SYRTE laboratory (SYstèmes de Référence Temps Espace, Observatoire de Paris, Paris, France) for a two-month measurement campaign.

About Us


ULISS Cryogenic Sapphire Oscillator is designed and marketed by FEMTO Engineering. FEMTO Engineering is the center for technological development of FEMTO-ST Research Institute...

The technology