Abstract
We present our investigations on the application of CPT effect as alternative to the traditional optical microwave double resonance in small atomic clocks [1]. An important factor which may limit the performances of CPT-based atomic clocks is the reduced signal contrast as compared to optical pumping. To overcome this limit, several excitation schemes have been proposed in the last years. Particularly, a significant enhancement of the CPT contrast can be obtained when co-propagating laser waves with parallel linear polarization (lin | | lin CPT) are resonant with the excited state Fe=l of alkali atoms.
© 2007 IEEE
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