Abstract
We present a microwave frequency standard based on coherent population trapping (CPT) in the line. The CPT spectrum is obtained using two Raman lasers with a frequency offset by injection locking of a master laser to a slave laser. We have constructed an atomic clock employing a long Rb vapor cell confined with neon buffer gas at . 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 . The frequency of a crystal oscillator has been stabilized to the CPT spectrum between the two ground states in . The relative frequency stability is approximately for an average time of .
© 2006 Optical Society of America
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