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. 2017 Jan 27;8:14000. doi: 10.1038/ncomms14000

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Copyright © 2017, The Author(s)

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/4.0/

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(a) Nitrogen-vacancy centre (NV⁻) level structure including phonon-added states (dashed and |3〉) with pumping and emission rates. Laser pumping (green) lifts population to the excited state, which can then decay via spontaneous emission (straight black arrows) or stimulated emission (red) due to interaction with a light field whose wavelength matches the |2〉↔|3〉 transition. (b) Laser excitation (red and green columns) with short pass and notch (grey). This setup blocks laser light from the detector but still allows to monitor both NV⁻ and NV⁰ emission. Example spectra are included: NV⁻ emission (orange), NV⁰ emission (blue) and mixed emission (grey). (c) Experimental setup.