Superluminescence at nitrogen-vacancy centers in the synthetic diamond pumped by laser radiation in the range of 532−575 nm

Photoluminescence spectra of two synthetic diamond samples containing 1−10 ppm nitrogen-vacancy (NV) centers and 100−200 ppm substitutional nitrogen were studied under optical pumping at 532, 560, and 575 nm. At pump intensities less than 0.5−1.0 MW/cm2 , a vibronic photoluminescence band of NV cent...

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