Analysis of spectral and temporal characteristics of stimulated emission of HPHT-diamonds with nitrogen-vacancy - colouring centres
T.S. Misnikova
Currently, the development of active laser materials is a promising direction, but diamond has not yet been applied in this field. Therefore, one of the most significant advances in diamond physics is stimulated emission (SE) and pulsed laser generation in the spectral range between 710 and 720 nm (1.72-1.74 eV). The presented work shows new experimental data on the spectral and temporal characteristics of stimulated emission produced at nitrogen-vacancy NV -centres (nitrogen-negatively charged vacancy centre) for single-sector {111} HPHT diamond. For this purpose, an experimental bench was developed to obtain spectral and temporal characteristics of the stimulated emission and experiments were carried out. As a result of the analysis of experimental data it was found that in the spectral range of 650-750 nm at excitation by laser radiation with λ=532 nm a rather narrow band of stimulated emission in the region of 705-730 nm with a maximum around 716 nm is emitted. It is demonstrated that there is some dependence of the shapes of spectra and pulses of radiation. It was found that a decrease in pumping energy and irradiation volumes of diamond leads to the appearance of mode structures on the spectrum and peak structures on the oscillogram, and an increase in the spectrum and oscillogram smoothing. However, when the pumping energy is maintained but the irradiation volumes are reduced, the smooth shape of spectra and pulses is preserved. At the same time, the intensity of the spectrum decreases and the duration of the irradiation pulse decreases. Previously, laser generation was obtained on this diamond sample, but it was not achieved in the present work. The reasons for this phenomenon are not clear yet and require additional experiments and analysis of the obtained results.
Information-measuring and Control Systems•Jan 1, 2025•1 citation