Angular frequency dependence of the real and imaginary parts of the complex index of refraction for a double resonance Lorentz model dielectric (solid curves) and the spectral amplitudes. Authors present the influence of the precursor fields of a double resonance Lorentz model dielectric on ultrashort pulse autocorrelation measurements and the resultant dynamical pulse width evolution [See article by Oughstun and Xiao Fig. 1 for details.]
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