Optical clocks such as the aluminum ion, ytterbium, and strontium clocks have much higher resonance frequencies, high enough to be in the spectrum of light ... While a cesium clock may be off ...

Maybe that’s even more than half of the fun. [CuriousMarc] got an HP 5061A Cesium clock, a somewhat famous instrument as the model that attempted to prove the theory of relativity. The reason?

As the industry’s first high-performance optical cesium atomic clock, the OSA 3300 HP sets new standards for accuracy and stability, while assuring 10 years of operation. It also strengthens ...

As the world’s first commercial optical cesium atomic clock, the OSA 3300 HP provides unmatched timing accuracy and long-term stability, offering a 10-year lifespan compared to the five-year ...

METAS needed a precise, reliable timing solution to complete its infrastructure, realize the Swiss national timescale UTC (CH) and optimally contribute to the realization of UTC Adtran’s OSA 3300 HP ...