Theoretical and Experimental Study of Light Shift in a CPT-Based Rb Vapor Cell Frequency Standard

M. Zhu, L. S. Cutler

Abstract:	One of the important subjects in coherent-population-trapping-based (CPT-based) vapor cell frequency standards is the light shift (ac Stark shift). We calculate the light shift using a numerical method and perturbation approximation. Experimentally, we measure light shift using a pair of phase-locked diode lasers as well as a frequency-modulated diode laser. There is good agreement between theory and experiment. A method of controlling light shift in CPT-based frequency standards is proposed and implemented in Agilent Laboratories. The short-term stability of our CPT-based rubidium vapor cell frequency standard is measured as 1.3 x 10^-I2 T^-1/2, which is limited by the phase noise of the reference local oscillator used.
Published in:	Proceedings of the 32th Annual Precise Time and Time Interval Systems and Applications Meeting November 28 - 30, 2000 Hyatt Regency Reston Town Center Reston, Virginia
Pages:	311 - 324
Cite this article:	Zhu, M., Cutler, L. S., "Theoretical and Experimental Study of Light Shift in a CPT-Based Rb Vapor Cell Frequency Standard," Proceedings of the 32th Annual Precise Time and Time Interval Systems and Applications Meeting, Reston, Virginia, November 2000, pp. 311-324.
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