Editing Maser (section)

===21st-century developments===
In 2012, a research team from the [[National Physical Laboratory (United Kingdom)|National Physical Laboratory]] and [[Imperial College London]] developed a [[solid-state physics|solid-state]] maser that operated at room temperature by using optically pumped, [[pentacene]]-doped [[p-Terphenyl]] as the amplifier medium.<ref>{{cite journal |last1=Brumfiel |first1=G. |doi=10.1038/nature.2012.11199 |title=Microwave laser fulfills 60 years of promise |journal=Nature |year=2012 |s2cid=124247048}}</ref><ref>{{cite news |last=Palmer |first=Jason |title='Maser' source of microwave beams comes out of the cold |url=https://www.bbc.co.uk/news/science-environment-19281566 |access-date=23 August 2012 |date=16 August 2012 |agency=BBC News |archive-url=https://web.archive.org/web/20160729110004/http://www.bbc.co.uk/news/science-environment-19281566 |archive-date=July 29, 2016}}</ref><ref>[http://www.nature.com/news/microwave-laser-fulfills-60-years-of-promise-1.11199 Microwave Laser Fulfills 60 Years of Promise]</ref> It produced pulses of maser emission lasting for a few hundred microseconds.

In 2018, a research team from [[Imperial College London]] and [[University College London]] demonstrated continuous-wave maser oscillation using [[synthetic diamond]]s containing [[nitrogen-vacancy center|nitrogen-vacancy]] defects.<ref>{{cite journal |last=Liu |first=Ren-Bao |date=March 2018 |title=A diamond age of masers |journal=Nature |language=EN |volume=555 |issue=7697 |pages=447–449 |doi=10.1038/d41586-018-03215-3 |pmid=29565370 |bibcode=2018Natur.555..447L |doi-access=free}}</ref><ref>[https://phys.org/news/2018-03-scientists-diamond-world-room-temperature-solid-state.html Scientists use diamond in world's first continuous room-temperature solid-state maser], phys.org</ref>