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

Abstract

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

28 pages, 12 figures

References in corpus (4)

• Stationary pulses of light in an atomic medium
• Metrological characterization of the pulsed Rb clock with optical detection
• Simple method of light-shift suppression in optical pumping systems
• Ultra-high Resolution Spectroscopy with atomic or molecular Dark Resonances: Exact steady-state lineshapes and asymptotic profiles in the adiabatic pulsed regime

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• A high-performance Raman-Ramsey Cs vapor cell atomic clock
• Dick effect in a pulsed atomic clock using Coherent Population Trapping
• Ramsey spectroscopy of high-contrast CPT resonances with push-pull optical pumping in Cs vapor
• A high-sensitivity push-pull magnetometer
• Dual-Frequency Sub-Doppler Spectroscopy: Extended Theoretical Model and Microcell-Based Experiments
• AC Stark Shifts of Dark Resonances Probed with Ramsey Spectroscopy
• Magneto-optical resonance of electromagnetically induced absorption with high contrast and narrow width in a vapour cell with buffer gas
• Coherent population trapping with polarization modulation
• Light Shift Suppression in Coherent-Population-Trapping Atomic Clocks in the Field of Two Circularly Polarized Light Beams
• Magnetic-field-insensitive coherent-population-trapping resonances excited by bichromatic linearly polarized fields on the $D_1$ line of ${}^{133}$Cs
• Homodyne detection of a two-photon resonance assisted by cooperative emission
• Derivation of CPT resonance signals from density-matrix equations with all relevant sublevels of Cs atoms and confirmation of experimental results
• Ultrahigh-Quality Magneto-Optical Resonances of Electromagnetically Induced Absorption in a Buffer-Gas-Filled Vapor Cell