Coherent two-photon spectroscopy for narrow linewidth atomic clocks in thermal alkali vapours

热碱蒸气中窄线宽原子钟的相干双光子光谱

• 批准号: 2140004
• 金额: --
• 依托单位: University of Strathclyde
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2018
• 资助国家: 英国
• 起止时间: 2018 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2140004
• 关键词: Coherent; two; photon; spectroscopy; narrow

The goal of this work is to take a step change in our approach towards a low SWaP atomic clock with excellent short-term stability (~10-13 in one second) and long-term accuracy (~10-15). The project will harness features of the current state-of-the art systems; firstly we will use two-photon probing of an optical transition allowing for a high-Q system. Secondly, we will use optical-dense thermal gases of alkali atoms that are key to CSACs (chip-scale atomic clocks).Work to be undertaken:- Use of commercially-available, pulsed 778-nm lasers for interrogation of the weakly-forbidden 5S1/2 - 5D5/2 in rubidium. - Connection with compact optical frequency combs. - Interrogation components into a single, compact system.Benefits:Two-photon probing of an optical transition crosses the boundary between microwave and optical clocks, and is a unique opportunity to bridge the divide in sensitivity of approximately three-orders of magnitude that currently exists between them. The use of pulsed lasers enables coherent enhancement of the clock-state interrogation. This is in addition to allowing the efficient use of commercially available telecoms lasers and components. Moving to thermal atoms removes the needs for laser cooling.

这项工作的目标是在我们的方法中迈出一步，实现具有出色的短期稳定性（约10-13秒）和长期精度（约10-15）的低SWaP原子钟。该项目将利用当前最先进的系统的功能;首先，我们将使用双光子探测的光学跃迁允许高Q系统。其次，我们将使用碱金属原子的光学致密热气体，这是CSAC（芯片级原子钟）的关键。要进行的工作：-使用商业上可获得的脉冲778 nm激光器来询问铷中的弱禁戒5S 1/2 - 5D 5/2。- 与紧凑型光频梳连接。- 优点：光学跃迁的双光子探测跨越了微波和光学时钟之间的界限，是弥合两者之间目前存在的大约三个数量级的灵敏度鸿沟的独特机会。脉冲激光的使用使得能够相干增强时钟状态询问。此外，还可以有效利用商业上可用的电信激光器和组件。转移到热原子消除了对激光冷却的需要。