  We introduce new lineshapes of coherent anti-Stokes Raman spectra of gases by
considering realistic nanosecond laser pulses that deviate from the Gaussian
representations of their time and spectral envelopes. The analysis suggests
that the contribution to the linewidth caused by the interaction with such
laser pulses could be erroneously attributed to the intrinsic Raman width if
the customary CARS approach, based primarily on the Voigt lineshape, is
assumed.
