Study on an all-optical microwave frequency standard

Normand Cyr; Michel Tetu; Marc Breton

doi:10.1117/12.143684

30 April 1993 Study on an all-optical microwave frequency standard

Normand Cyr, Michel Tetu, Marc Breton

Proceedings Volume 1837, Frequency-Stabilized Lasers and Their Applications; (1993) https://doi.org/10.1117/12.143684
Event: Applications in Optical Science and Engineering, 1992, Boston, MA, United States

Abstract

We describe a simple method to produce a clock transition with purely optical means through modulated pumping. We observe the field-independent ground state resonance of ⁸⁷Rb atoms using sinusoidal modulation of the injection current of an AlGaAs laser diode emitting at 780 nm (FM modulation). We detect the 6.835 GHz resonance with a modulation frequency of 1.139 GHz. A high contrast resonance peak is observed and a condition for zero light shift is found. With a beam radius of approximately 3 mm and a buffer gas (N₂) pressure of 680 Pa (5.1 Torr), a minimal linewidth of 290 Hz is observed. A theoretical study of the excitation of hyperfine coherences by a modulated laser beam is given.

Citation Download Citation

Normand Cyr, Michel Tetu, and Marc Breton "Study on an all-optical microwave frequency standard", Proc. SPIE 1837, Frequency-Stabilized Lasers and Their Applications, (30 April 1993); https://doi.org/10.1117/12.143684

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