微波功率锁定的高性能CPT原子钟频综

doi:10.3969/j.issn.1000-1158.2025.02.15

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Abstract To achieve high performance coherent population trapping （CPT） atomic clocks， a high-performance frequency synthesizer with power locked is set up. The CPT atomic clocks require a microwave source to modulate laser that generates coherent two-color light which interact with the atomic system to obtain a very narrow linewidth resonance CPT signal and lock in the local frequency. Since its microwave modulation applies to the light， eliminating microwave cavity， CPT clocks can be portable or even chipped. Meanwhile， the short-term frequency stability of high-performance CPT atomic clocks have been demonstrated at the level of ~2×10^-13τ^-1/2（τ=1-10 000 s）. At this level， the Dick effect or intermodulation effect induced by microwave phase noise become limiting factors for the further improvement of the CPT clocks. For this， we realise a low phase 3.417 GHz noise synthesizer with power-locked. The experimental results show the absolute phase noise of the high performance power locked frequency synthesizer is -55.27 dBc/Hz， -83.85 dBc/Hz， -110.4 dBc/Hz， -129.5 dBc/Hz， -132.5 dBc/Hz at 1 Hz， 10 Hz，100 Hz，1 kHz，10 kHz. Its contribution of intermodulation effect to CPT atomic clocks is 5.0×10^-14， which is analysed at the double low frequency modulation frequency. Residual stability is 7.99×10^-15at 1 s， which is more than one order of magnitude higher than the best CPT atomic clocks reported so far in the sampling time range τ=1~10 000 s. After power locking， the power stability is improved by five times at 10 000 s.

Key words： metrology microwave synthesizer CPT low phase noise residual frequency stability power stabilized

Received: 20 November 2023 Published: 04 March 2025

PACS:

TB939

Corresponding Authors: 恩学云 E-mail: yunenxue@ntsc.ac.cn

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	WEN Zhiqiang
	YUN Enxue
	SUN Siyu
	YANG Tenghui
	WANG Bisong
	WANG Leigang
	LUO Xin
	XU Jin
	SUN Bingfeng
	LI Wenbing
	HAO Qiang

Cite this article:

WEN Zhiqiang,YUN Enxue,SUN Siyu, et al. A Power Stabilized Low Noise Frequency Synthesizer for CPT Atomic Clocks[J]. Acta Metrologica Sinica, 2025, 46(2): 267-273.

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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2025.02.15 OR http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2025/V46/I2/267

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