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Abstract
Self-stabilization of the laser pulse parameters is demonstrated during the two-color filamentation of ultrashort and intense laser pulses in gases. Experimental data and results of numerical simulations show, in good qualitative agreement, that the root-mean-square values of the intensity fluctuations decrease below the initial value for the near-infrared pump pulse and the perturbative limit for the third-harmonic pulse in the filament. It is found that the stabilization of the third-harmonic intensity and energy are due to intensity clamping of the pump pulse and a constant ‘volume’ of the laser pulse during the nonlinear propagation inside the filament.
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