, Volume 73, Issue 3, pp 287-290
Date: 11 Feb 2014

Intensity clamping and re-focusing of intense femtosecond laser pulses in nitrogen molecular gas

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We present results of measurements of fluorescence spectra due to the interaction of a Ti:sapphire laser pulse with N2 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.

Received: 21 May 2001 / Revised version: 10 July 2001 / Published online: 19 September 2001