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

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 $\varphi$ 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.

9 pages, 8 figures, submitted to Physical Review Applied, under review

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Cited by in corpus (1)

• Direct spectroscopy of Rubidium using a narrow-line transition at 420 nm