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The NIST Frequency Measurement and Analysis Service (FMAS) makes it easy to measure and calibrate any quartz, rubidium, cesium, or hydrogen maser … more
Every four years, the Committee on Data for Science and Technology (CODATA) issues recommended values of the fundamental physical constants. The … more
The cooling of atoms to microkelvin temperatures using lasers is currently enabling a new generation of precision instruments that take advantage … more
Since 1970, the National Institute of Standards and Technology (NIST) has awarded Precision Measurement Grants to faculty members of U.S. … more
A simple, compact alternative to the highest performing optical standards, the Ca clock uses a thermal beam of neutral atoms with one or two … more
Optical cavities are essential elements of optical atomic clocks, as they serve to pre-stabilize the clock laser. Our Group is currently … more
The League of SI Superheroes is Running Out of Time!
Getting Better All the Time: JILA Strontium Atomic Clock Sets New Records
'Comb on a Chip' Powers New NIST/Caltech Atomic Clock Design
NIST’s Internet Time Service Serves the World
Coherent cavity-enhanced dual-comb spectroscopy
Detecting GNSS Spoofing using a Network of Hardware Oscillators
Optical system design for femtosecond-level synchronization of clocks
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Date created: February 21, 2010 | Last updated: March 10, 2016