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Maser is activated by green laser light; the red light is fluorescence from the NV centers; (right) the diamond is held inside a sapphire ring before the laser is used.
(Left) The maser is activated by green laser light; the red light is fluorescence from the NV centers; (right) the diamond is held inside a sapphire ring before the laser is used. Image: Photo credits: Thomas Angus / Jonathan Breeze, Imperial College London.
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