The concept of spectral representation of nonstationary wave fields is considered, and as an example the far-zone diffraction from a slit is discussed. In particular it is shown that the red shift of the spectrum of the diffraction pattern for the off-axis points of observation is the same for stationary polychromatic and nonstationary light sources with the same spectral composition and that under certain conditions a slit splits the Gaussian-shaped pulse into two separate pulses.
© 1995 Optical Society of America
Mario Bertolotti, Aldo Ferrari, and Leonid Sereda, "Far-zone diffraction of polychromatic and nonstationary plane waves from a slit," J. Opt. Soc. Am. B 12, 1519-1526 (1995)