基于驻波拉曼光场的磁不敏态物质波对称分束
文献类型：学位论文
| 作者 | 陈康 |
| 学位类别 | 硕士 |
| 答辩日期 | 2016 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 李晓林 |
| 关键词 | 磁不敏态 驻波拉曼光场 对称分束 原子干涉仪 |
| 其他题名 | Symmetric matter-wave splitting with magnetically insensitive states using standing wave Raman light |
| 中文摘要 | 物质波相干分束是原子干涉仪研究的核心问题之一，利用光脉冲动量相干物质波分束的方法通常有两种，内态分束和外态分束，内态分束方案干涉路径大多非对称，会引入路径依赖的噪声，而且外界磁场的扰动会引起频移，这将降低干涉条纹的对比度。外态分束可实现对称分束和干涉路径共轭，但不同外态容易与原子热运动耦合，难以得到较高的信噪比。 结合以上两种分束方法，我们提出了利用磁不敏叠加态进行相干对称分束，并且采用内态干涉探测相位差的方案。 我们建立了基于Raman-Nath分束的三能级模型，分析了造成单脉冲对称分束效率低下的原因并引入了双脉冲对称分束，通过优化脉冲参数获得了较大的保真度(n=4，保真度为93.3%)，并且提出了相应的内态干涉方案。 |
| 英文摘要 | Coherent matter wave splitting is one of the key processions in atom interferometer. Generally, there are two categories of methods to achieve momentum coherent matter- wave splitting with light pulses so far, internal state splitting and external state splitting. In internal state splitting it will trigger path dependent noise because of non-reciprocal interference path. Besides, the external magnetic fluctuation can produce frequency shift which will decrease the contrast of interference fringe. In external state splitting although the interference path is reciprocal, the momentum states is coupled with atom thermal motion and di?cult to obtain high signal-to-noise ratio. Motivated by these two limits, we present an internal state interference scheme by symmetrically splitting atomic wave packet initially prepared in a magnetically insensitive superposition internal state and we also give a proposal to achieve internal interference in experiment. We present a three-level model based on Raman-Nath matter wave splitting, analyze the reason of low diffraction efficiency in single pulse symmetrical splitting and introduce the double pulse symmetrical splitting. We optimize the pulse parameter and obtain a relatively large fidelity (n=4, fidelity is 93.3%), lastly we present the scheme of internal interference. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16981]  |
| 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 | 陈康. 基于驻波拉曼光场的磁不敏态物质波对称分束[D]. 中国科学院上海光学精密机械研究所. 2016. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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