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We report on a theoretical study and experimental characterization ofcoherent population trapping (CPT) resonances in buffer gas-filled vapor cellswith push-pull optical pumping (PPOP) on Cs D1 line. We point out that thepush-pull interaction scheme is identical to the so-called lin per linpolarization scheme. Expressions of the relevant dark states, as well as ofabsorption, are reported. The experimental setup is based on the combination ofa distributed feedback (DFB) diode laser, a pigtailed intensity Mach-Zehnderelectro-optic modulator (MZ EOM) for optical sidebands generation and aMichelson-like interferometer. A microwave technique to stabilize the transferfunction operating point of the MZ EOM is implemented for proper operation. ACPT resonance contrast as high as 78% is reported in a cm-scale cell for themagnetic-field insensitive clock transition. The impact of the laser intensityon the CPT clock signal key parameters (linewidth - contrast -linewidth/contrast ratio) is reported for three different cells with variousdimensions and buffer gas contents. The potential of the PPOP technique for thedevelopment of high-performance atomic vapor cell clocks is discussed.

Coherent Population Trapping Resonances in Buffer Gas-filled Cs Vapor Cells with Push-Pull Optical Pumping