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.

Two-photon optical frequency reference with active AC Stark shift cancellation



Vladislav P. Gerginov, Kyle P. Beloy


An optical reference based on two-photon optical transition with AC stark shift cancellation is proposed. The reference uses two interrogating laser fields at different frequencies. Compared to conventional optical two-photon references, the new approach offers the possibility for increased short-term stability resulting from a higher signal-to-noise, and improved long-term stability due to active AC Stark shift cancellation. We demonstrate the AC Stark shift cancellation method on the 5s 2S1/2 -> 5d 2D5/2 two-photon transition in 87Rb.
Physical Review Applied


AC Stark shift, Optical frequency reference, two-photon spectroscopy


Gerginov, V. and Beloy, K. (2018), Two-photon optical frequency reference with active AC Stark shift cancellation, Physical Review Applied, [online], (Accessed May 23, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created July 30, 2018, Updated February 21, 2019