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

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...

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Veröffentlicht in:	Applied physics. B, Lasers and optics Lasers and optics, 2001-09, Vol.73 (3), p.287-290
Hauptverfasser:	BECKER, A, AKÖZBEK, N, VIJAYALAKSHMI, K, ORAL, E, BOWDEN, C. M, CHIN, S. L
Format:	Artikel
Sprache:	eng
Schlagworte:	Beam trapping, self-focusing and defocusing self-phase modulation Beam trapping, self-focusing, and thermal blooming Clamping Exact sciences and technology Femtosecond Fundamental areas of phenomenology (including applications) Gas pressure Lasers Mathematical analysis Mathematical models Nonlinear optics Optical and dielectric properties Optics Physics Physics of gases Physics of gases, plasmas and electric discharges Signatures Spectra
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Beschreibung
Zusammenfassung:	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.
ISSN:	0946-2171 1432-0649
DOI:	10.1007/s003400100637