EFOS3

EFOS-3 is the third of 12 masers made by the Neuchatel Observatory/Oscilloquartz from the early 80's onwards. EFOS is an acronym for "Etalon de Frequence Os cilloquartz". It was followed by EFOS B (1990) and C (1995), and then by the current iMaser-line at T4Science, who acquired the technology and core team from Neuchatel Observatory in 2006. To date, more than 100 masers in the "family" has been built. EFOS-3 was initially installed at Wettzell along side EFOS-1 around 1983, but was later replaced by a newer maser.