论文标题
紧凑型459 nm CS单元格频率标准$ 2.1 \ times {10}^{ - 13}/\sqrtτ$短期稳定性
Compact 459 nm Cs cell optical frequency standard with $2.1\times{10}^{-13}/\sqrtτ$ short-term stability
论文作者
论文摘要
我们达到了一个紧凑的光频标准，其扩展的空腔二极管激光器锁定在459 nm 6s $ _ {1/2} $ -7p $ _ {1/2} $过渡热$^{133} $ cs原子中的$ 50 mm $ $ \ $ \ $ 50 mm $ 50 mm的玻璃玻璃单元，使用模量转换。此激光器的自估计频率稳定性为$ 1.4 \ times {10}^{ - 14}/\sqrtτ$。通过杂尼测量，我们验证了MTS锁定的线宽划分效应，并测量锁定激光器的频率稳定性。 MTS稳定后，每个激光的线宽从自由运行的69.6 kHz降低到10.3 kHz，为6.75倍。通过Beat检测测量的Allan偏差为$ 2.1 \ times {10}^{ - 13}/\sqrtτ$对于每个MTS稳定激光器。此外，我们根据额外的测量值测量7p $ _ {1/2} $能级的超精细结构，并计算CS 7p $ _ {1/2} $级别的磁性偶极常数$ a $ a $ a $ a $ a $ a $ a $ a $ a $ _ {1/2} $级别为94.38（6）MHz，与先前的测量良好同意。这种紧凑的光学频率标准也可以用于需要高稳定激光器的其他应用中，例如激光干扰法，激光冷却，地球等。
We achieve a compact optical frequency standard with an extended cavity diode laser locked to the 459 nm 6S$_{1/2}$ - 7P$_{1/2}$ transition of thermal $^{133}$Cs atoms in a $ϕ$ 10 mm $\times$ 50 mm glass cell, using modulation transfer spectroscopy (MTS). The self-estimated frequency stability of this laser is $1.4\times{10}^{-14}/\sqrtτ$. 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 $2.1\times{10}^{-13}/\sqrtτ$ 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.
