Coherent Light. (Physical Sciences and Engineering: Lasers. Generation of light by stimulated emission)

Roy J. Glauber

"The subject of this book is the generation and amplification of light by stimulated emission of radiation." Not for beginners, this slender volume presents a great deal of important material for those who are competent in mathematics and physics. It will be of considerable interest to the advanced research worker who has occasion to deal with this rapidly developing field.

Jan Jeske, Desmond W. M. Lau, Xavier Vidal +12 more

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− magnetometers 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. Here Jeskeet al. show both theoretical and experimental evidence for stimulated emission from negatively charged nitrogen vacancy centres using light in the phonon sidebands around 700 nm, demonstrating its suitability as a laser medium.

Mitsuo Maeda

Vladilen S Letokhov, B. D. Pavlik