论文标题
宽范围线性磁力计基于亚微晶k蒸气电池
Wide range linear magnetometer based on a sub-microsized K vapor cell
论文作者
论文摘要
$^{39} $ k原子具有最小的基态（$^2S_ {1/2} $）超细胞分裂的所有最自然的碱同位素，因此，最小的特征磁场值$ b_0 = a _ _ {^2s_ {^2s_ {1/2}}/μ_b\ g， $ a _ {^2s_ {1/2}} $是基态的磁性偶极相互作用常数。在超精美的paschen-back政权（$ b \ gg b_0 $，其中$ b $是应用于原子上的外部磁场的幅度），仅在$^{39} $ k的$ d_1 $线的吸收光谱中可见8个zeeman过渡，而均为39} $ k的概率，同时又是16 Zeeman Transitions tofferage 16 Zeeman Transitions toffibilitys toverage the Repainemant toverage the Repainemantions toverage 16 Zeeman Transitions tofforsions。在$^{39} $ K的情况下，此行为已经在相对较低的磁场$ b> b_0 $中达到。对于每个循环极化（$σ^ - ，σ^+$），使用厚度的亚微晶蒸气单元$ L = 120-390 $ nm记录具有子多普勒宽度的4个频谱分辨的原子过渡。我们提出了一种允许在$ 0.1-10 $ kg范围内使用微米空间分辨率测量磁场的方法，这与确定具有较大梯度的磁场（最高3 g $/μ$ M）有关。理论模型很好地描述了实验结果。
$^{39}$K atoms have the smallest ground state ($^2S_{1/2}$) hyperfine splitting of all the most naturally abundent alkali isotopes and, consequently, the smallest characteristic magnetic field value $B_0 = A_{^2S_{1/2}}/μ_B \approx 170$ G, where $A_{^2S_{1/2}}$ is the ground state's magnetic dipole interaction constant. In the hyperfine Paschen-Back regime ($B \gg B_0$, where $B$ is the magnitude of the external magnetic field applied on the atoms), only 8 Zeeman transitions are visible in the absorption spectrum of the $D_1$ line of $^{39}$K, while the probabilities of the remaining 16 Zeeman transitions tend to zero. In the case of $^{39}$K, this behavior is reached already at relatively low magnetic field $B > B_0$. For each circular polarization ($σ^-,σ^+$), 4 spectrally resolved atomic transitions having a sub-Doppler width are recorded using a sub-microsized vapor cell of thickness $L = 120 - 390$ nm. We present a method that allows to measure the magnetic field in the range $0.1 - 10$ kG with micrometer spatial resolution, which is relevant in particular for the determination of magnetic fields with a large gradient (up to 3 G$/μ$m). The theoretical model describes well the experimental results.
