Fig. 4.
Example of fringe smearing by spectral bandwidth. Fringes are plotted for many wavelengths within a broadband filter (Rλ = 5). All are plotted with a period of 5 λ/D, but due to the changing wavelength the physical fringe periods in the focal plane change as well. This results in significant fringe blurring after only a few periods from the center.
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