Phase-related noise characteristics of 780 nm band single-frequency lasers used in the cold atomic clock

doi:10.1088/1674-1056/28/7/074209

Abstract

We propose a method to directly measure phase-related noise characteristics of single-frequency lasers in the 728-980 nm band based on a 120° phase difference interferometer. Differential phase information of the laser under test is demodulated via the interferometer. Other parameters related to the phase noise characteristics such as linewidth at different observation time, phase/frequency noise, power spectrum density of phase/frequency fluctuation, and Allan deviation are further obtained. Frequency noise as low as 1 Hz²/Hz can be measured using our system. Then the phase-related noise characteristics of two commercial lasers frequently used in cold atomic clocks are studied systematically by the method. Furthermore, several influencing factors and their relative evolution laws are also revealed, such as the pump current and frequency-locking control parameters. This would help to optimize the laser performance, select laser sources, and evaluate the system performance for cold atomic physics applications.

Keywords: cold atomic physics quantum mechanics 780 nm lasers phase/frequency noise

Received: 08 April 2019
Revised: 09 May 2019
Accepted manuscript online:

PACS:	42.55.-f	(Lasers)
	42.60.Mi	(Dynamical laser instabilities; noisy laser behavior)
	31.30.J-	(Relativistic and quantum electrodynamic (QED) effects in atoms, molecules, and ions)
	03.75.Be	(Atom and neutron optics)

Fund:

Project supported by the National Natural Science Foundation of China (Grant Nos. 61875214, 61535014, and 61775225) and Scientific Innovation Fund of Chinese Academy of Sciences (Grant No. CXJJ-17S010).

Corresponding Authors: Fei Yang, Hai-Wen Cai
E-mail: fyang@siom.ac.cn;hwcai@siom.ac.cn

Cite this article:

Xi Zhang(张茜), Fei Yang(杨飞), Zi-Tong Feng(冯子桐), Jie-Jun Zhao(赵洁珺), Fang Wei(魏芳), Hai-Wen Cai(蔡海文), Rong-Hui Qu(瞿荣辉) Phase-related noise characteristics of 780 nm band single-frequency lasers used in the cold atomic clock 2019 Chin. Phys. B 28 074209

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Phase-related noise characteristics of 780 nm band single-frequency lasers used in the cold atomic clock

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