Precision Measurement Group
We develop and extend measurement platforms of high value to fundamental physics; with an increasing focus on industrial, medical and defence contexts. Our group has three key streams of activity: Frequency Standards & Distribution, Frequency Combs & Spectroscopy, and Quantum Atom-Fibre Photonics.
Frequency Standards and Distribution
We are developing optical and microwave sources having extremely high frequency stability for high impact physics experiments and real world applications. These include direct measurement of Einstein’s time dilation effect, as well as frequency references for: leading-edge atomic clocks, optical and radio astronomy, and radar applications.
We are also developing a fibre dissemination network to allow fast and precise frequency comparison between frequency standards within different laboratories. This can be extended to time dissemination over large scales for applications such as the square kilometre array (SKA) radio telescope.
- Cryogenic Sapphire Oscillator
- Portable Ytterbium Clock
- Compact Rubidium Frequency Standard
- Stabilized Fibre Link
Sensing and Spectroscopy
The optical frequency comb is a Nobel Prize winning innovation in laser technology that is revolutionising spectroscopy. We use this massively parallel laser source to characterise atomic and molecular samples with unprecedented precision, accuracy, and speed. We also specialise in precision laser absorption and two-photon spectroscopy, both within conventional cells and fibre-based architectures, with applications in fundamental physics, frequency standard development, quantum computing, and all-optical atomic magnetometers for high sensitivity magnetometry. We are also developing high-precision sensors based on crystalline-disc whispering gallery resonators, primarily for world leading precision measurements of temperature.
- Optical Breath Analysis
- Real-Time Contaminant Monitoring in Liquid Natural Gas Processing
- High Precision Atomic Magnetometry
- Primary Thermometry
- Whispering Gallery Resonators for Precision Thermometry
- Atom Trap Trace Analysis
The advent of hollow-core photonic crystal fibre has revolutionised methods for creating strong interactions between light and matter. This is achieved by confining light and gas within the same small volume. We are making use of this technology to explore extreme atom-light interaction phenomena, such as the creation of efficient quantum memories and frequency-conversion.