Comparison of the output parameters of He + Eu and Ne + Eu lasers
V.G. Sokovikov, A.G. Filonov, D.V. Shiyanov
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
Keywords: лазер на парах европия, ионный Eu-лазер, атомный Eu-лазер, буферный газ, деградация активной среды, europium vapor laser, ion Eu-laser, atom Eu-laser, buffer gas, degradation of the active medium
Abstract
The lasing characteristics of atomic He + Eu and Ne + Eu vapor lasers at the y8P9/2 → 87Deq \o\al(11/2,0) transition with a wavelength of 1.76 mm were compared. It is shown that the output power and pulsed energy of the He + Eu laser, depending on the pump power and pulse repetition frequency, are slightly worse than those of the Ne + Eu laser. An empirical model is proposed to explain the behavior of the He + Eu laser output power as a function of the input power. It was established that the lifetime of the He + Eu laser does not exceed two hours, while the Ne + Eu laser by the end of the experiment operated about 200 hours. It has been suggested that the relaxation of metastable levels of the ion and atom of europium and degradation of active media consisting of a mixture of europium and helium vapors is responsible for the same process involving helium.
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