Effects of light on cesium 6S-8S two-photon transition

This work presents a simple approach for determining the contribution of Lorentzian or Gaussian statistics by data fitting the spectrum to a Voigt profile. The fitting result shows that the Lorentzian width remains almost constant (similar to 1.51 MHz) and the Gaussian width increases (similar to 1.0-2.0 MHz) while changing the laser intensity or atomic density. The frequency shift associated with the cesium 6S-8S two-photon transition as a function of laser power is approximately -7.25(45) Hz/(mW/mm(2)), agrees closely with the theoretical value. These results can be used to improve the optical secondary frequency standard in the near infrared region. (C) 2009 Elsevier B.V. All rights reserved.