Abstract
This paper reports on a compact table-top Cs clock based on coherent population trapping (CPT) with advanced frequency stability performance. The heart of the clock is a single buffer gas Cs-Ne microfabricated cell. Using a distributed feedback (DFB) laser resonant with the Cs D1 line, the contrast of the CPT signal is found to be maximized around 80°C, a value for which the temperature dependence of the Cs clock frequency is canceled. Advanced techniques are implemented to actively stabilize the clock operation on a zero-light-shift point. The clock frequency stability is measured to be 3.8 × 10(-11) at 1 s and well below 10(-11) until 50,000 s. These results demonstrate the possibility to develop high-performance chip-scale atomic clocks using vapor cells containing a single buffer gas.
Highlights
This paper reports on a compact table-top Cs clock based on coherent population trapping (CPT) with advanced frequency stability performance
The buffer gas is required to reduce the CPT resonance broadening resulting from depolarizing wall collisions and to eliminate Doppler broadening through Lamb–Dicke
We present a compact CPT clock prototype based on a Cs microfabricated cell filled with Ne, combined with an externally-modulated distributed feedback (DFB) laser resonant with the Cs D1 line
Summary
This paper reports on a compact table-top Cs clock based on coherent population trapping (CPT) with advanced frequency stability performance. The short-term frequency stability of a passive atomic clock is improved by both reducing the detected resonance linewidth and increasing its signal-to-noise ratio.
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