@article{oai:repo.qst.go.jp:00049213,
 author = {Jeske, Jan and W., M. Lau Desmond and VIdal, Xavier and P., McGuinness Liam and Reineck, Philipp and C., Johnson Brett and W., Doherty Marcus and C., McCallum Jeffrey and Onoda, Shinobu and Jelezko, Fedor and Oshima, Takeshi and Volz, Thomas and H., Cole Jared and C., Gibson Brant and D., Greentree Andrew and 小野田 忍 and 大島 武},
 issue = {14000},
 journal = {Nature Communications},
 month = {Feb},
 note = {Stimulated emission is the process fundamental to laser operation, thereby producing coherent photon output. Despite negatively charged nitrogen-vacancy (NV ) centres being discussed as a potential laser medium since the 1980s, there have been no definitive observations of stimulated emission from  ensembles of NV  to date. Here we show both theoretical and experimental evidence for stimulated emission from NV  using light in the phonon sidebands around 700 nm. Furthermore, we show the transition from stimulated emission to photoionization as the stimulating laser wavelength is reduced from 700 to
620 nm. While lasing at the zero-phonon line is suppressed by ionization, our results open the possibility of diamond lasers based on NV  centres, tuneable over the phonon sideband. This broadens the applications of NV  agnetometers from single centre nanoscale sensors to a new generation of ultra-precise ensemble laser sensors, which exploit the contrast and signal amplification of a lasing system.},
 pages = {1--8},
 title = {Stimulated emission from nitrogen-vacancy centres in diamond},
 volume = {8},
 year = {2017}
}