Skip to main content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

A high stability optical frequency reference based on thermal calcium atoms

Published

Author(s)

Richard W. Fox, Jeffrey A. Sherman, W. Douglas, Judith B. Olson, Andrew D. Ludlow, Christopher W. Oates

Abstract

Here we report an imprecision below 10-14 with a simple, compact optical frequency standard based upon thermal calcium atoms. Using a Ramsey-Borde spectrometer we excite features with linewidths 1S0-3P1 intercombination line at 657 nm. We have measured a fractional frequency instability below 6 x 10-15 at 1 s, with good prospects for still quieter performance. The key remaining issue is for this standard is how well first- and second-order Doppler drifts can be suppressed. Due to its experimental simplicity such a system could find application as a high stability reference for commercial applications.
Proceedings Title
Proceedings of 2012 IEEE Frequency Control Symposium
Conference Dates
May 21-24, 2012
Conference Location
Baltimore, MD
Conference Title
2012 IEEE Frequency Control Symposium

Keywords

frequency standards, optical clocks
Created May 24, 2012, Updated February 19, 2017