Amplification of picosecond pulses in a gas amplifier of THL-100 laser system
A.G. Yastremsky1, M.V. Ivanov1, N.G. Ivanov1, V.F. Losev1,2
1High Current Electronics Institute of the Siberian Branch of the RAS, 634055, Tomsk, 2/3, Academichesky ave. HCEI SB RAS
2National Research Tomsk Polytechnic University, 30, Lenin Avenue, Tomsk, 634050, Russia
Keywords: усилитель, лазерная система THL-100, численное моделирование, пространственная однородность, amplifier, THL-100 laser system, the spatial intensity distribution, numerical simulation
Abstract
Evolution of spatial and energy characteristics of start pulse with energy of 0.8 mJ and duration of 2 ps in the amplifier of THL-100 laser system have been studied experimentally and by numerical simulation. Laser radiation energy E = 2 J was obtained experimentally. In this work we present a 3D amplification model of conically diverging laser beams, which takes into account the spatial inhomogeneity of the pump and the geometry of THL-100 laser system amplifier. Description and the test results of the model are submitted. At the start pulse energy of 0.8 mJ the calculated radiation energy at the amplifier output reaches 2.4 J. Simulation results show that maximal intensity of the laser radiation in this mode reaches P = 60 GW × сm-2. Evolution of energy and space-time structure of the laser pulse in the amplifier was investigated. It is shown that in the ideal case (excluding the processes of nonlinear interaction of laser beam with the active medium), at the start pulse energy of 5 mJ, the energy of the laser radiation at the output of the amplifier is increased to E out = 3.8 J. In this mode, the maximal radiation intensity reaches a value of I = 148 GW × сm-2.
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