Compact 459 nm Cs cell optical frequency standard with $2.1\times{10}^{-13}/\sqrt{\tau}$ short-term stability

• URL: http://arxiv.org/abs/2206.09409v1
• Date: Sun, 19 Jun 2022 14:15:42 GMT
• Title: Compact 459 nm Cs cell optical frequency standard with $2.1\times{10}^{-13}/\sqrt{\tau}$ short-term stability
• Authors: Jianxiang Miao and Tiantian Shi and Jia Zhang and Jingbiao Chen
• Abstract summary: We achieve a compact optical frequency standard with an extended cavity diode laser locked to the 459 nm 6S$_1/2$ - 7P$_1/2$ transition of thermal atoms. The self-estimated frequency stability of this laser is $1.4times10-14/sqrttau$. This compact optical frequency standard can also be used in other applications that require high-stability lasers, such as laser interferometry, laser cooling, geodesy, and so on.
• Score: 3.328399140054283
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We achieve a compact optical frequency standard with an extended cavity diode laser locked to the 459 nm 6S$_{1/2}$ - 7P$_{1/2}$ transition of thermal $^{133}$Cs atoms in a $\phi$ 10 mm $\times$ 50 mm glass cell, using modulation transfer spectroscopy (MTS). The self-estimated frequency stability of this laser is $1.4\times{10}^{-14}/\sqrt{\tau}$. With heterodyne measurement, we verify the linewidth-narrowing effect of MTS locking and measure the frequency stability of the locked laser. The linewidth of each laser is reduced from the free-running 69.6 kHz to 10.3 kHz after MTS stabilization, by a factor of 6.75. The Allan deviation measured via beat detection is $2.1\times{10}^{-13}/\sqrt{\tau}$ for each MTS-stabilized laser. In addition, we measure the hyperfine structure of the 7P$_{1/2}$ energy level based on the heterodyne measurements, and calculate the magnetic dipole constant $A$ of the Cs 7P$_{1/2}$ level to be 94.38(6) MHz, which agrees well with previous measurements. This compact optical frequency standard can also be used in other applications that require high-stability lasers, such as laser interferometry, laser cooling, geodesy, and so on.

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