A numerical study of coherent laser pulse evolution in CO<sub>2</sub> in the framework of the Maxwell—Schrödinger equations up to the intensity 10<sup>13</sup> W/cm<sup>2</sup> 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
S. Chelkowski and A. D. Bandrauk, "Multilevel nonlinear effects in the amplification of ultrashort laser pulses in CO2," J. Opt. Soc. Am. B 7, 90-100 (1990)