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 centers in the negative charge state was observed. With an increase in the pump intensity above 0.5−1.0 MW/cm2, a superluminescence band was observed on the long-wavelength shoulder of the phonon wing in the range of 700−760 nm. The superluminescence band intensity increased with the pump intensity. It is shown that the position of the superluminescence band with maxima in the range of 715−720 nm remains unchanged at all optical pump wavelengths.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 11, pp. 82–85, November, 2022.
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Lipatov, E.I., Genin, D.E., Shulepov, M.A. et al. Superluminescence at Nitrogen-Vacancy Centers in the Synthetic Diamond Pumped by Laser Radiation in the Range of 532−575 nm. Russ Phys J 65, 1881–1885 (2023). https://doi.org/10.1007/s11182-023-02846-y
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DOI: https://doi.org/10.1007/s11182-023-02846-y