Volume 119, Number 2, July 2017
|Number of page(s)||7|
|Section||Atomic, Molecular and Optical Physics|
|Published online||28 September 2017|
Differential detection scheme for compact CPT atomic clocks
1 Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology Wuhan, 430074, China
2 Key Laboratory of Atomic Frequency Standards, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences - Wuhan, 430071, China
Received: 8 July 2017
Accepted: 31 August 2017
A scheme is investigated for a coherent population trapping (CPT) atomic clock, wherein the polarization of a beam produced by a vertical-cavity surface-emitting laser is converted to an elliptically polarized beam that interacts with alkali atoms, where the CPT signal is extracted by differentially detecting the magneto-optically rotated light within the transmitted beam. The scheme eliminates the spin-polarized trap state of the atoms and the unwanted background signal, and suppresses in the CPT signal the noise converted from the laser noise. This result reveals the promise of this scheme for realizing a compact CPT atomic clock possessing a significantly improved frequency stability compared to current compact CPT atomic clock devices, coupled with similar power consumption, volume, and cost therewith.
PACS: 32.80.Qk – Coherent control of atomic interactions with photons / 42.50.Gy – Effects of atomic coherence on propagation, absorption, and amplification of light; electromagnetically induced transparency and absorption / 06.30.Ft – Time and frequency
© EPLA, 2017
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