Abstract

High-contrast coherent population trapping signals were observed on the Cs D1 line by use of a bichromatic linear polarized light (linlin field). A maximum absorption contrast of about 10% was obtained. This was nearly twice as high as that measured with the standard configuration of bichromatic circularly polarized light (σσ field). The results are compared with density matrix calculations of 4 and 5 level systems.

© 2009 Optical Society of America

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