Abstract

We report an optical frequency standard based on the $5s\to 5d$ two-photon transition in Rb atoms. The frequency of a $\lambda =778 \mathrm{nm}$ 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 $\lambda =1.556 \mathit{\mu }\mathrm{m}$ for use in optical fiber communication applications.

© 1997 Optical Society of America

Frequency stabilization of a frequency-doubled 1556-nm source to the 5S_1/2 → 5D_5/2 two-photon transitions of rubidium

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Absolute frequency measurement of rubidium 5S–7S two-photon transitions with a femtosecond laser comb

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Dual-interrogation method for suppressing light shift in Rb 778 nm two-photon transition optical frequency standard

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Observation of rubidium 5S_1/2→7S_1/2 two-photon transitions with a diode laser

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