标题： 磁场对稳频于分子碘的激光频率的影响 显示英文标题

标题： Influence of a magnetic field on the frequency of a laser stabilized to molecular iodine

摘要： 我们报告了施加在一个用于激光频率稳定的碘池上的弱磁场的影响。一个1.5$~\mu$米的激光被倍频以激发分子跃迁到0.51$~\mu$米，并且被锁定在一个超精细线路上。通过这个频率参考，我们报告了短期稳定性约为$3\,\times\,10^{-14}~\tau^{-1/2}$，最小值为$4\,\times\,10^{-15}$在200秒时。在我们的案例中，只有在密封石英碘池周围加上有效的磁屏蔽才能达到$10^{-15}$频率稳定域的下部。为了量化塞曼效应，我们在含有碘蒸气的池子上施加了几$\,\times\,10^{-4}$~T的磁场。塞曼效应对线条形状跃迁产生影响，这样我们可以观察到激光频率的改变。 我们测量了在细胞中沿磁场方向，R(34) 44-0跃迁的$a1$超精细成分附近的514 nm附近线性Zeeman位移，其值为$(1062\pm6)\,\times\,10^{4}$Hz/T。因此，在大小为1$\,\times\,10^{-4}$T量级的未控制磁场的情况下，频率稳定性受限于$10^{-14}$域的上限。 显示英文摘要

摘要： We report on the effect of a weak magnetic field applied on an iodine cell used to frequency stabilize a laser. A 1.5$~\mu$m laser is frequency tripled in order to excite the molecular transitions at 0.51$~\mu$m and frequency locked on a hyperfine line. With this frequency reference, we report short-term stability about $3\,\times\,10^{-14}~\tau^{-1/2}$, with a minimum value of $4\,\times\,10^{-15}$ at 200~s. The lower part of $10^{-15}$ frequency stability domain is reached, in our case, only by adding an efficient magnetic shield around the sealed quartz iodine cell. In order to quantify the Zeeman effect, we applied magnetic fields of several $\,\times\,10^{-4}$~T on the cell containing the iodine vapour. The Zeeman effect affects the lineshape transition in such a way that we observe a modification of the laser frequency. We have measured this linear Zeeman shift at $(1062\pm6)\,\times\,10^{4}$~Hz/T for the $a1$ hyperfine component of the R(34)~44-0 transition, near 514~nm by applying a magnetic field along the cell. Thus, in case of uncontrolled magnetic fields of an order of magnitude of 1$\,\times\,10^{-4}$~T, the frequency stability is limited in the upper of the $10^{-14}$ domain.