Latest results of a double-modulation coherent population trapping clock

David F. Phillips, Irina V. Novikova, C. Y. T. Wang +2 more

Elizabeth A. Donley, François-Xavier Esnault, E. Blanshan +3 more

Ke Deng, Tao Guo, Juan Su +5 more

Peter Yun, François Tricot, Claudio Eligio Calosso +5 more

Atomic clocks based on coherent population trapping and constructive polarization modulation are promising for high performance and compact devices. We have demonstrated a cw mode CPT clock with a short-term fractional frequency stability at the level of 3. \pmb2×10-13/√{τ} for a few 100 s integration time. This Double-Modulation CPT technology can be reduced to a miniature and robust setup due to its linear architecture. This clock could find future applications in industry, telecommunications, instrumentation, or global navigation satellite systems.

David F. Phillips, Brian M. Murphy, Michael Crescimanno +4 more

Peter Yun, François Tricot, David Holleville +2 more

We demonstrate an atomic clock based on double-modulation CPT. With a high contrast CPT signal observed in this scheme, we get a preliminary result of the frequency stability: 4×10-13 at 1 second. It shows the possibility to implement an atomic clock with a compact and robust setup while still maintaining its high performance.