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Determination of the inertial contribution to the nonlinear refractive index of air, N2, and O2 by use of unfocused high-intensity femtosecond laser pulses

Erik Nibbering 1 G. Grillon 1 Michel Franco 1 Bernard Prade 1 André Mysyrowicz 1
1 LOA - Laboratoire d'optique appliquée
Abstract : We analyze the spectral changes that occur when unfocused intense femtosecond pulses at 800 nm propagate through different atomic and molecular gases. The observed red shift in the self-phase-modulated spectra after propagation through N2, O2, and air is attributed to a delayed change of the nonlinear refractive index, a consequence of the molecular response to impulsive excitation of rotational coherences. We compare these results on the nonlinear refractive index with those obtained from Ar, Xe, and SF6.
Keywords : nonlinear optics kerr effect
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https://hal-polytechnique.archives-ouvertes.fr/hal-00465603
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Submitted on : Friday, March 19, 2010 - 11:46:15 PM
Last modification on : Wednesday, July 3, 2019 - 10:48:02 AM

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Erik Nibbering, G. Grillon, Michel Franco, Bernard Prade, André Mysyrowicz. Determination of the inertial contribution to the nonlinear refractive index of air, N2, and O2 by use of unfocused high-intensity femtosecond laser pulses. Journal of the Optical Society of America. B, Optical Physics, The Society, 1997, 14 (3), pp.650-660. ⟨10.1364/JOSAB.14.000650⟩. ⟨hal-00465603⟩

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