Skip to main content
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.

Laser noise cancellation in single-cell CPT clocks



Vladislav Gerginov, Svenja A. Knappe, V Shah, Leo W. Hollberg, John E. Kitching


We demonstrate a new technique for the suppression of noise associated with the laser source in atomic clocks based on coherent population trapping. The technique uses differential detection of the transmission of linearly- and circularly-polarized beams propagating through different parts of a single rubidium vapor cell filled with a buffer gas mixture. The common-mode noise, associated with the laser frequency and amplitude noise, is suppressed by the differential detection of the two laser beams. The CPT signal, present only in the circularly polarized laser beam, is unaffected. The technique is simple and applicable in compact and chip-scale devices.
IEEE Transactions on Instrumentation and Measurement


atomic clock, chip-scale atomic clock, coherent population trapping, noise


Gerginov, V. , Knappe, S. , Shah, V. , Hollberg, L. and Kitching, J. (2008), Laser noise cancellation in single-cell CPT clocks, IEEE Transactions on Instrumentation and Measurement, [online], (Accessed April 16, 2024)
Created July 1, 2008, Updated February 17, 2017