We discuss advantages of the “end” resonances for the miniaturized, chip-scale atomic clocks based on alkali-vapor cells filled with high-pressure buffer gases. Compared to the commonly used 0-0 resonance clock design, these advantages include a higher signal-to-noise ratio, a narrower linewidth at high vapor densities, and a significantly reduced sensitivity to the frequency stability of the pump laser at high buffer-gas pressure. We report our measurements of the ~(133)Cs resonance linewidth for both 0-0 and end transitions, and give the estimates of the ~(133)Cs resonance-damping rates due to N_2 buffer gas. Contributions to the total linewidth from other broadening mechanisms are also discussed. Finally, we demonstrate a 1 kHz end resonance linewidth in a MEMS-fabricated microcell containing cesium and 1 atm N_2.
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