铷原子双光子光频标谱线信噪比影响因素研究

doi:10.3964/j.issn.1000-0593(2025)07-1894-06

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Abstract The optical frequency standard based on two-photon transition is expected to become a miniaturized optical atomic clock available in the future. Acquiring spectral lines with a high signal-to-noise ratio is an important prerequisite for achieving high-performance optical frequency standards. The experimental setup of the two-photon transition optical frequency standard was completed. The factors affecting the signal-to-noise ratio of the optical frequency standard spectral line were experimentally analyzed from the aspects of laser intensity, atomic density, and the gain of the photomultiplier tube, and the signal-to-noise ratio of the optical frequency standard transition spectral line under different parameter values was obtained. Experimental results show that the spectral line's signal-to-noise ratio increases linearly with the increase of the laser intensity in the range of 15 700 mW·mm^-2.When the atomicitydensity reaches 1.5×10¹³ cm^-3 and the PMT gain is 1.2×10⁵, the signal-to-noise ratio of the spectral line reaches saturation. The signal-to-noise ratio of the spectral line of the two-photon transition optical frequency standard obtained by this setup can reach up to 2600. Considering that the linewidth of the two-photon transition spectral line is 1MHz, the short-term frequency stability of the optical frequency standard is expected to reach 3×10^-13τ^-1/2. By studying the factors affecting the signal-to-noise ratio of two-photon optical frequency standard spectral lines based on Rubidium atoms, the atomic transition spectral line with a high signal-to-noise ratio is obtained, which is of great significance for the development of high-performance and integrated two-photon optical frequency standards.

Key words：Two-photon transition;Optical frequency standard;Transition spectral lines;Signal-to-noise ratio(SNR)

Received: 2024-12-25 Accepted: 2025-02-24

ZTFLH:

O562.3

Corresponding Authors: ZHAI Hao, XIAO Yu-hua, WANG Ji E-mail: 2692244353@qq.com；yhxiao2004@sina.com；20138295@qq.com

Cite this article:

ZHANG Jiong-yang,ZHAI Hao,XIAO Yu-hua, et al. Study on the Factors Affecting the Signal-to-Noise Ratio of Two-Photon Optical Frequency Standard Spectral Lines Based on Rubidium Atom[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2025, 45(07): 1894-1899.

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https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2025)07-1894-06 OR https://www.gpxygpfx.com/EN/Y2025/V45/I07/1894

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