On the possibility of generating THz radiation at a difference frequency in a ZnGeP2 single crystal when pumping with strontium vapor laser radiation
N.N. Yudin1, V.V. Dyomin2, A.N. Soldatov2, A.S. Shumeiko2, N.A. Yudin1,2
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634055, Russia
2National Research Tomsk State University, 36, Lenin Avenue, Tomsk, 634050, Russia
Keywords: лазер на парах стронция, разностная частота, терагерцовое излучение, strontium vapor laser, differential frequency generation, terahertz radiation
Abstract
The conditions for the formation of THz radiation in ZnGeP2 single crystals when generating a difference frequency are considered. It is shown that two-frequency laser pumping sources with lasing pulse duration of ~ 1 ns are required to implement effective THz radiation. It is suggested to use a “generator - amplifier” system of a strontium vapor laser (at the Sr I transitions in the region 3 mm and Sr II in the region 1 mm) as such a source of IR radiation. The conditions of population inversion are considered, under which the lasing pulse duration is ~ 1 ns in the active medium of the strontium vapor laser. It is shown that the use of the “generator -amplifier” system can increase the average lasing power of the strontium vapor laser in proportion to the increase in the volume of active medium of the amplifier.
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