U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Physical Measurement Laboratory

Time and Frequency Division

The Time and Frequency Division maintains the standard for frequency and time interval for the United States, provides official time to the United States, and carries out a broad program of research and service activities in time and frequency metrology.

NIST on a chip

NIST-on-a-Chip in ADI
NIST-F1 Cesium Fountain Atomic Clock

NIST-F1 Cesium Fountain Atomic Clock
Yb Lattice Clock

Yb Lattice Clock

Popular Links

News and Updates

Industry Impacts

Close up of the NIST chip-scale atomic clock

Navigation through Timekeeping

Accurate navigation requires precision timing synchronization to about 1 billionth of a second per day. New applications require timing mechanisms that can

Projects and Programs

CaPhoto

Calcium Thermal Beam Optical Clock

Ongoing
A simple, compact alternative to the highest performing optical standards, the Ca clock uses a thermal beam of neutral atoms with one or two lasers to achieve
Compact Cold Atom Clock

Compact Cold Atom Instruments

Ongoing
The cooling of atoms to microkelvin temperatures using lasers is currently enabling a new generation of precision instruments that take advantage of the long
Web interface to control and monitor the servo with interactive blocks

FPGA Design

Ongoing
Our group is developing FPGA based digital phase noise measurement and control systems.

Awards

Patents

Optical Reference Cavity

NIST Inventors
Franklyn Quinlan , Scott Diddams and Andrew Ludlow
Patent Description We have demonstrated an easy-to-manufacture 25-mm-long ultra-stable optical reference cavity geared toward transportable photonic microwave generation systems and mobile optical atomic clock applications. The cavity can be rigidly held in a way that is first-order insensitive to

Nobel Prize

2012 Nobel Prize in Physics to Dave Wineland of NIST Time and Frequency Division

Dave Wineland, of the Ion Storage Group, shares the 2012 Nobel Prize in Physics with Serge Haroche of France "for ground-breaking experimental methods that enable measuring and manipulation of individual quantum systems." Dave and his colleagues use these techniques for research in quantum information processing, quantum simulation, atomic clocks, and other areas.

More information about the Ion Storage Group can be found here.

For more information about the 2012 Nobel Prize in Physics, please see the Nobel Prize organization site.

Selected Publications

Contacts

Division Chief

Division Secretary