Kudryashov S I, Khmelnitskii R A, Danilov P A, Smirnov N A, Levchenko A O, Kovalchuk O E, Uspenskaya M V, Oleynichuk E A, Kovalev M S
Opt Lett. 2021 Mar 15;46(6):1438-1441. doi: 10.1364/OL.414583.
Ultrafast heating of photoionized free electrons by high-numerical-aperture (0.25-0.65) focused visible-range ultrashort laser pulses provides their resonant impact trapping into intra-gap electronic states of point defect centers in a natural IaA/B diamond with a high concentration of poorly aggregated nitrogen impurity atoms. This excites fine-structured, broadband (UV-near-infrared) polychromatic luminescence of the centers over the entire bandgap. The observed luminescence spectra revealed substitutional nitrogen interaction with non-equilibrium intrinsic carbon vacancies, produced simultaneously as Frenkel "vacancy-interstitial" pairs during the laser exposure.
通过高数值孔径（0.25 - 0.65）聚焦的可见光范围超短激光脉冲对光离子化自由电子进行超快加热，能将其共振俘获到天然IaA/B型金刚石中具有高浓度聚集性差的氮杂质原子的点缺陷中心的能隙内电子态中。这激发了中心在整个带隙上的精细结构、宽带（紫外 - 近红外）多色发光。观察到的发光光谱揭示了替代氮与非平衡本征碳空位的相互作用，这些空位是在激光照射期间作为弗伦克尔“空位 - 间隙”对同时产生的。
