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All-optical microwave frequency standard: a proposal

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3 Author(s)
Cyr, N. ; Dept. de Genie Electr., Laval Univ., Sainte-Foy, Que., Canada ; Tetu, Michel ; Breton, M.

A simple method to produce a clock transition with purely optical means by modulated pumping is described. 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) is observed. The 6.835 GHz resonance with a subharmonic modulation frequency of 1.139 GHz is detected. A high-contrast resonance peak is observed and a condition for zero light shift is found. The linewidth is 3 kHz (at 6.835 GHz) in this preliminary experiment, due to the small size of the light beam (~2 mm diameter) and the low buffer gas pressure (680 Pa) that was used. A theoretical model that explains the main features of the experiment is described

Published in:

Instrumentation and Measurement, IEEE Transactions on  (Volume:42 ,  Issue: 2 )

Date of Publication:

Apr 1993

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