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19 November 2019 New method of wavelength stabilisation in CPT atomic clocks
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We propose a novel way of radiation wavelength stabilisation in atomic clocks based on coherent population trapping (CPT). It uses quadrature-phase component of the CPT signal within the CPT resonance feedback loop and automatic wavelength locking of radiation from a VCSEL to the atomic absorption line. We demonstrate advantages and limitations of the new method applied to vapour cells with buffer gas or anti-relaxation coating. Also provided are measurements of short- and long-term stability of a CPT-based atomic clock using the proposed method with various optical cells. Discussed are the prospects of this method in chip-scale atomic clocks.
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Sergey Kobtsev, Daba Radnatarov, Sergey Khripunov, Valerii Andryushkov, and Yurii Zarudnev "New method of wavelength stabilisation in CPT atomic clocks", Proc. SPIE 11184, Optoelectronic Devices and Integration VIII, 1118414 (19 November 2019);

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