正交偏振探测技术在原子频率标准中的应用
文献类型：学位论文
| 作者 | 林锦达 |
| 学位类别 | 博士 |
| 答辩日期 | 2013 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 王育竹 |
| 关键词 | 脉冲光抽运原子钟 非线性磁光效应 正交偏振探测 阿兰方差 暂态效应 |
| 其他题名 | Application of Orthogonal Polarization Detection Technology in Atomic Clocks |
| 中文摘要 | 本论文主要介绍了我在脉冲光抽运气泡式铷原子钟方面的工作，主要内容可以分为三个部分： 1)介绍了我在热铷原子钟平台上实现电磁感应透明实验、相干存储原子钟实验和四波混频放大信号实验等前期工作。 2）介绍了我们小组提出的基于磁光效应的正交偏振探测技术。其中详细介绍了该方案的理论计算、我们将该方案应用于探测连续光抽运原子钟和脉冲光抽运原子钟钟跃迁信号等上面的应用。 3）介绍了正交偏振探测技术在实验观测原子与光子相互作用暂态过程中的应用。 本论文的主要创新点在于:这是国际上首次提出的将基于磁光效应的正交偏振探测技术应用于原子钟中。该方法提高了原子钟钟跃迁信号的探测灵敏性和对比度。本论文涉及的原子钟主要有连续光抽运型铷原子钟和脉冲光抽运铷原子钟两种类型，但是本论文提出的探测方法不仅仅限于这两种类型的原子钟，而是适用于所有光探测类型的原子钟。该方法最主要的优点在于探测到的信号主要反应了光的相位变化而不仅仅是振幅变化，因而大大抑制了散弹噪声和激光噪声。在此基础上，本论文介绍了非线性磁光效应的正交偏振探测技术，该效应可用于压窄跃迁信号的谱线线宽。随着微波强度的变大，光与原子相互作用过程的非线性效应开始显现。前向散射峰开始发生分裂，并形成伪共振峰。该效应与分离振荡场技术相结合，可使得到的拉姆齐条纹中心谱线的线宽减小一半。 本论文还介绍了正交偏振探测方法的另一个潜在应用。由于磁光效应探测的灵敏度大大高于吸收法探测。因而其对激光频率的依赖程度也远小于吸收法探测对光频率的依赖程度。如果利用大失谐的激光探测原子的话，相当于是量子无破坏测量，它与利用量子纠缠产生的结果一致，冲破了投影噪声极限。因而可以改变阿兰方差与探测时间原先的负1/2次方的关系，成为负一次方关系，从而提高原子钟的频率稳定度。 |
| 英文摘要 | This thesis presents my work on the pulsed optically pumped (POP) vapor-cell Rb atomic clock. 1) Introduced my early work on electro-magnetically-induced-transparency effect, pulsed coherent storage atomic clock, and four wave mixing effect. 2) Introduced the orthogonal polarization detection technology that has been used in the detection of the atomic clock signal, which includes the theoretical calculation, the application of orthogonal polarization detection technology in the continuous-optically pumped (POP) atomic clock and pulsed optically pumped atomic clock. 3) Introduce the application of the dispersive detection in observing the transient effects of atom-photon interaction: the Rabi oscillation, EIT effect and the separation of the optical precursor. The main contribution of this thesis is that, the detection technique based on the magneto-optical effect has for the first time been used to improve the sensitivity and contrast of the atomic clock transition signals. It is necessary to say that the detection technique proposed here is applicable not only for the continuous pumped and the POP atomic clock, but also for all the atomic clocks using optical detection. The greatest strength of the detection technique is that the signal detected is not only attributed to the amplitude variation of the optical field, but also attributed to the phase variation of the optical field. As a result, the shot noise and the fluctuation of the light background are suppressed as much as possible. In the mean time, only the forward scattering signal can get to the detector which leads to the greatest suppression of the laser noise. Based on the advantages mentioned above, the frequency stability of the atomic clock characterized by Allan deviation has been improved by an order of magnitude. Moreover, the detection technique based on the nonlinear magneto-optical effect has been used to suppress the line-width of the clock transition signal. As the power of the microwave increases, the nonlinear effect of the atom-photon interaction emerges. The splitting of the forward scattering signal can be treated as a pseudo-resonance line. Combining with the Ramsey technique, the line-width of the central zone of Ramsey fringe is one half of the result with absorption detection. Another possible application of the dispersive detection is introduced. As we have mentioned above, the sensitivity of the dispersive detection is much higher than the absorption detection, the dependence on the optical frequency of magneto-optical rotation is much less than the quantum projection detection. Therefore, optical field with large frequency detuning can be used as a non-destructive measurement. The Allan deviation will vary in a new way because of the repeatable detection of the same atom state. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/15733]  |
| 专题 | 上海光学精密机械研究所_学位论文 |
| 推荐引用方式 GB/T 7714 | 林锦达. 正交偏振探测技术在原子频率标准中的应用[D]. 中国科学院上海光学精密机械研究所. 2013. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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