Close

Search

Search Menu
Photonics Media Photonics Buyers' Guide Photonics EDU Photonics Spectra BioPhotonics EuroPhotonics Industrial Photonics Photonics Showcase Photonics ProdSpec Photonics Handbook
More News
SPECIAL ANNOUNCEMENT
2016 Photonics Buyers' Guide Clearance! – Use Coupon Code FC16 to save 60%!
share
Email Facebook Twitter Google+ LinkedIn Comments

Atomic Clocks Set Stability Record

Photonics.com
Aug 2013
GAITHERSBURG, Md., Aug. 23, 2013 — At the National Institute of Standards and Technology (NIST), a pair of experimental atomic clocks based on ytterbium atoms has set a new record for stability.

Acting like 21st-century pendulums, the clocks have perfect timing and could, potentially, swing back and forth with precise ticks for a period comparable to the age of the universe.

NIST physicists report that the tick of the ytterbium clocks is more stable than that of any other atomic clock, with each tick matching every other tick to within less than two parts in one quintillion (10-18). This is roughly 10 times more accurate than in previously published reports.


In NIST’s ultrastable ytterbium lattice atomic clock, ytterbium atoms are generated in an oven (large metal cylinder on the left) and sent to a vacuum chamber in the center of the photo to be manipulated and probed by lasers. Laser light is transported to the clock by five fibers (such as the yellow fiber in the lower center of the photo). Courtesy of Burrus/NIST. 

This breakthrough has the potential for significant impacts not only on timekeeping, but also on a broad range of sensors, including those that measure gravity, magnetic fields and temperature. This accuracy is also a major step in the evolution of next-generation atomic clocks.

"The stability of the ytterbium lattice clocks opens the door to a number of exciting practical applications of high-performance timekeeping," said NIST physicist Andrew Ludlow.

Each of NIST's ytterbium clocks relies on 10,000 rare-earth atoms cooled to 10 µK and trapped in an optical lattice – a series of pancake-shaped wells made of laser light. Another laser that "ticks" 518 trillion times per second provokes a transition between two energy levels in the atoms.

The ytterbium clocks can make measurements extremely rapidly – in real time in many cases – which could be important in rapidly changing application settings, such as factory floors or the natural environment.

A key advance in the development of ytterbium clocks was the recent construction of a second version of the clock to measure and improve the performance of the original, developed since 2003. Along the way, NIST scientists have made several improvements to both clocks, including the development of an ultralow-noise laser to excite the atoms, and the ability to cancel disruptive effects caused by atom collisions.

The research was published in Science Express.  

For more information, visit: www.nist.gov


Comments
Terms & Conditions Privacy Policy About Us Contact Us
back to top

Facebook Twitter Instagram LinkedIn YouTube RSS
©2016 Photonics Media
x We deliver – right to your inbox. Subscribe FREE to our newsletters.