Abstract
Within the Fresnel approximation, we investigate the spectral characteristics in the near zone when a certain class of partially coherent light is incident on a circular aperture. It is shown that, as the distance z between the aperture and the on-axis observation point decreases, the spectral shifts show gradual change. However, when z approaches a critical value, a rapid spectral switch occurs. The evolution from a gradual spectral shift to a rapid spectral switch is illustrated. The effect of the coherence on the spectral switch is also presented.
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