Towards faster and quantum-noise limited maser materials; developments in miniaturising and searching for new organic maser gain media*

There has been rapid development for masers at room temperature, the microwave analogue of lasers, where their ability to amplify the weakest electrical signals and superb frequency stability give them the potential to revolutionise medical sensors and frequency standards for GPS communication. The talk will be about a promising new material for room temperature masers; diazapentacene doped para-terphenyl (DAP). DAP holds the record as the maser with the fastest startup time, can be pumped by longer wavelengths of red light, and is more chemically stable than the first room temperature maser made from pentacene. We will also report on recent successes on the miniaturisation of organic masers, including pentacene, through optimized dielectric cavities and pumping sources. We have produced a fully operating device with the highest masing peak powers yet achieved, all while forgoing bulky magnetic fields and being able to demonstrate strong coupling for cavity quantum electrodynamics experiments at room temperature. The extensive optical and paramagnetic characterisations that will be presented will provide fertile ground for studying and finding new maser materials for quantum sensors, spintronics, and the exploration of tailored materials in optoelectronics.