Abstract

We report an optical frequency standard based on the 5s5d two-photon transition in Rb atoms. The frequency of a λ=778 nm diode laser was locked to the two-photon transition. Second-harmonic generation and an optical phase-locked loop were used to transfer the frequency stability to λ=1.556 µm for use in optical fiber communication applications.

© 1997 Optical Society of America

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