Time and frequency metrology at NIST


Sherman, J. (2014). Time and frequency metrology at NIST. Perimeter Institute. https://pirsa.org/14060011


Sherman, Jeff. Time and frequency metrology at NIST. Perimeter Institute, Jun. 16, 2014, https://pirsa.org/14060011


          @misc{ pirsa_14060011,
            doi = {10.48660/14060011},
            url = {https://pirsa.org/14060011},
            author = {Sherman, Jeff},
            keywords = {},
            language = {en},
            title = {Time and frequency metrology at NIST},
            publisher = {Perimeter Institute},
            year = {2014},
            month = {jun},
            note = {PIRSA:14060011 see, \url{https://pirsa.org}}

Jeff Sherman National Institute of Standards & Technology - Time and Frequency Division


Official U.S. time is currently realized by an ensemble of commercial cesium-beam atomic clocks and hydrogen masers. Cesium-fountain devices presently serve as ultimate frequency references and help to define the SI second. The present quandary is: these microwave-based standards are rapidly becoming outmatched by new optical atomic frequency references---by a factor of 1,000 in stability, and perhaps a factor of 100 in accuracy. I will survey the ongoing optical atomic clock projects at NIST and highlight related work in optical time and frequency measurement and transfer.