The current state of development of lasers at NV centers in diamond
Дмитрий Евгеньевич Генин, Andrey V. Samolov
In this paper, a brief overview of the main characteristics of lasers at NV centers in diamond is carried out. Currently, lasers at NV centers in a negative charge state generate pulsed laser radiation in the range of 714-720 nanometers with a duration of units of nanoseconds with a pulse energy of tens of microjoules and an efficiency of several percent. A significant increase in the efficiency and energy characteristics of NV lasers can be achieved through the use of multilayer reflective coatings on the faces of crystals as resonator mirrors. Lasers of this class have good prospects in the field of obtaining femtosecond pulses, since NV centers have a wide luminescence contour. Due to the high thermal conductivity of the diamond, they are able to provide generation with a high level of average power. To increase the pulse duration and transition to continuous generation, it is necessary to pump with a high level of average power. A possible solution would be injection pumping. This requires the creation of efficient light-emitting diamond electroconductive structures. In addition, the article presents new data on the study of spectral characteristics of the superluminescence of the NV centers of a diamond laser when the crystal is heated from 100 to 300 K. It is shown that the superluminescence band of such lasers actually consists of two spectral components that are not resolved at room temperature. The temperature behavior of these components is fundamentally different: the short-wave component practically does not change in intensity, while the long-wave component exponentially increases in intensity to 220 K, and then saturates and further decreases according to Mott's law. In addition, it was found that the maxima of these components experience a shift in the long-wavelength direction by about 6 meV when the temperature changes from 100 to 300 K. In the future, it is necessary to find out the exact nature and physical mechanisms of the detected phenomena, as well as to find their possible practical applications. The authors declare no conflicts of interests.
Tehnologii bezopasnosti žiznedeâtelʹnosti.•Jan 1, 2024•0 citations