Technical Physics Letters
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Amplification in the Yb:YAG medium at cryogenic temperatures
Demyanov A.V.
1, Makarov K.N. 1, Ostrovskiy V.A. 1, Pergament M.I.1
1Troitsk Institute for Innovation and Fusion Research, Russian Academy of Sciences, Troitsk, Moscow, Russia
Email: demyanov@triniti.ru, makarov@triniti.ru, ostrovskiy@triniti.ru, pergam@triniti.ru
A numerical model of a disk cryogenic Yb:YAG diode-pumped amplifier with pulse energy of tens and hundreds of joules is presented. The model accounts for the change in the shape of the pump pulse spectrum during its propagation through the gain medium consisting of several active elements with different levels of doping with ytterbium ions. Amplification of spontaneous emission, which limits the inversion, is considered in the model in the 3-dimensional geometry for the real spectrum shape and for each active element according to the energy absorbed in it. The simulation results are compared with the currently published experimental data for amplifiers with pulse energies above 100 J. Keywords: pulsed periodic lasers, amplification of spontaneous emission, Yb:YAG, cryogenic cooling, modeling.
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