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We report the detection of high-contrast and narrow Coherent PopulationTrapping (CPT) Ramsey fringes in a Cs vapor cell using a simple-architecturelaser system. The latter allows the combination of push-pull optical pumping(PPOP) and a temporal Ramsey-like pulsed interrogation. An originality of theoptics package is the use of a single Mach-Zehnder electro-optic modulator (MZEOM) both for optical sidebands generation and light switch for pulsedinteraction. Typical Ramsey fringes with a linewidth of 166 Hz and a contrastof 33 % are detected in a cm-scale buffer-gas filled Cs vapor cell. Thistechnique could be interesting for the development of high-performance and lowpower consumption compact vapor cell clocks based on CPT.

Ramsey spectroscopy of high-contrast CPT resonances with push-pull optical pumping in Cs vapor