Abstract

We present a microwave frequency standard based on coherent population trapping (CPT) in the Rb87D1 line. The CPT spectrum is obtained using two Raman lasers with a 6.8GHz frequency offset by injection locking of a master laser to a slave laser. We have constructed an atomic clock employing a 5cm long Rb vapor cell confined with 6.67kPa neon buffer gas at 70°C. Using this system, we improve the CPT contrast through the elimination of undesired off-resonant fields created by the direct modulation method. We measured the frequency shift of the CPT signal as a function of the temperature of the Rb cell and estimated it to be approximately 1.3×109K. The frequency of a 10MHz crystal oscillator has been stabilized to the CPT spectrum between the two ground states in Rb87. The relative frequency stability is approximately 2.3×1012 for an average time of 68s.

© 2006 Optical Society of America

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