Search Menu
Photonics Media Photonics Buyers' Guide Photonics EDU Photonics Spectra BioPhotonics EuroPhotonics Industrial Photonics Photonics Showcase Photonics ProdSpec Photonics Handbook
More News

Chip-Scale Atomic Clock Refined

Facebook Twitter LinkedIn Email Comments
At the National Institute of Standards and Technology in Boulder, Colo., researchers have developed a 12-mm3 atomic clock based on the D1 line in rubidium-87 that may find applications in mobile communications and navigation systems. The instrument, which they describe in the Feb. 21 issue of Optics Express, displays superior short- and long-term stability compared with their first, recently reported clock, which was based on the D2 transition in cesium.
The clock features a 1-mm3 cell filled with rubidium vapor, into which heating elements, an optics assembly, a near-IR vertical-cavity surface-emitting laser and a photodetector are integrated. At an ambient temperature of 22 °C, the device consumes 195 mW, and the researchers predict that this may be lowered to less than 50 mW.
Over periods of less than a minute, the atomic clock displays a frequency instability in the range of 10211, but this increases to 1029 for periods as long as a day, which the scientists attribute to contamination of the vapor cell with nitrogen. A potential limitation of the device involves the existence of a dark trapping state that requires the cell to be heated to 120 °C, consuming power.

Photonics Spectra
Mar 2005
As We Go To Pressatomic clockBasic ScienceBreaking NewsCommunicationsConsumermobile communicationsNational Institute of Standards and TechnologyPresstime BulletinSensors & Detectors

back to top
Facebook Twitter Instagram LinkedIn YouTube RSS
©2019 Photonics Media, 100 West St., Pittsfield, MA, 01201 USA,

Photonics Media, Laurin Publishing
x Subscribe to Photonics Spectra magazine - FREE!
We use cookies to improve user experience and analyze our website traffic as stated in our Privacy Policy. By using this website, you agree to the use of cookies unless you have disabled them.