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Optics Communications

Two-photon spectroscopy of laser-cooled Rb using a mode-locked laser

Michael J. Snadden, A.S. Bell, Erling Riis, A. I. Ferguson

Published Apr 1, 1996• 76 citations
Publisher
DOI
10.1016/0030-4018(95)00711-3

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We propose to utilize an Er-doped fiber laser locked to a cooled Rb two-photon transition (TPT) resonance as a frequency standard for fiber-based optical communication. We show experimentally that a continuous wave laser beam can enhance the strength of cooled Rb TPT as much as 2.5 times. The cooled Rb TPT resonance excited by the fiber frequency combs has a measured linewidth of about 900 kHz. After locking the repetition rate of the fiber laser to the cooled Rb TPT resonance, the stability reaches 1.5×10−13 with 100 s averaging time. The results demonstrate that the proposed method in this paper is promising to provide the radio frequency standard for fiber-based optical communication.
Summary form only given. We have previously demonstrated two-photon spectroscopy using a modelocked laser in samples of laser-cooled /sup 85/Rb and /sup 87/Rb. In this paper we present a mechanism with which to frequency stabilize the probe laser in resonance with the two-photon transition. We show that frequency modulation spectroscopy provides an ideal signal to frequency stabilize the laser to the line center. By modulating at a high frequency one can also work where technical noise in the laser is very low.