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Multilevel nonlinear effects in the amplification of ultrashort laser pulses in CO2

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Abstract

A numerical study of coherent laser pulse evolution in CO2 in the framework of the Maxwell–Schrödinger equations up to the intensity 1013 W/cm2 is presented. The model includes various nonresonant vibrational–rotational transitions usually neglected in low-intensity simulations. Level degeneracy is taken into account, and light-polarization effects are discussed. The limiting intensities up to which various models work are established.

© 1990 Optical Society of America

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