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

Lead Research Organisation: University of Strathclyde
Department Name: Physics

Abstract

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.

Publications

10 25 50

Studentship Projects

Project Reference Relationship Related To Start End Student Name
EP/R513167/1 01/10/2018 30/09/2023
2140004 Studentship EP/R513167/1 01/10/2018 30/09/2022 Brendan Lukas Keliehor