World's first continuous room-temperature solid-state maser built using diamond

The maser (microwave amplification by stimulated emission of radiation), the older microwave frequency sibling of the laser, was invented in 1954. However unlike lasers, which have become widespread, masers are much less widely used because in order to function they must be cooled to temperatures close to absolute zero (-273°C). However, this new study from Imperial College London and UCL, and published in Nature, reports for the first time a maser that can act continuously at room temperature.