Sie sind die derzeit genauesten Uhren der Welt: Cäsium-Fontänenuhren liefern die Sekunde auf 15 Stellen hinter dem Komma genau. Bis sie diese Genauigkeit erreichen, brauchen allerdings auch Cäsium-Fontänenuhren eine gewisse Messzeit. Diese Zeit ist nun mit einer neuen Methode, die in der Physikalisch-Technischen Bundesanstalt (PTB) entwickelt worden ist und die Ausgangsfrequenz der Cäsium-Fontänen stabiler macht, deutlich verkürzt worden. Die PTB-Physiker nutzen eine neuartige Mikrowellenquelle, um die Cäsiumatome in einen angeregten Zustand zu versetzen: Sie ersetzen den schwingenden Quarz durch einen Mikrowellenoszillator, der mit Hilfe eines Lasers derart stabilisiert wird, dass sein Rauschen für den Fontänenbetrieb vernachlässigbar klein wird. Dabei fanden
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