APPLIED PHYSICS B-LASERS AND OPTICS, cilt.73, sa.3, ss.287-290, 2001 (SCI-Expanded)
We present results of measurements of fluorescence spectra due to the interaction of a Ti:sapphire laser pulse with N(2) molecules at different gas pressures and pulse energies. The analysis of the data together with the results of numerical simulations, using a propagation model, reveal signatures of the phenomena of intensity clamping and of re-focusing of the laser pulse at high gas pressure. The laser pulse energy for intensity clamping as a function of the gas pressure is determined.