By Professor Dr. Werner Lauterborn, Dr. rer. nat. Thomas Kurz, Dipl.-Phys. Martin Wiesenfeldt (auth.)
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1964) M. Alonso, E. J. Finn: Physics (Addison-Wesley, Reading, Mass. 2 R. 3 J. Durnin, J. J. , J. H. Eberly: "Diffraction-free beams", Phys. Rev. Lett. 58, 1499-1501 (1987) J. Durnin: "Exact solutions for nondiffracting beams. I. The scalar theory", J. Opt. Soc. Am. A4, 651--654 (1987) F. Gori, G. Guattari. C. Padovani: "Bessel-Gauss beams", Opt. Commun. 4 A. Vasara, J. Turunen, A. T. Friberg: "Realization of general nondiffracting beams with computer-generated holograms", J. Opt. Soc. Am. A6, 17481754 (1989) G.
Without proof we state some properties of the degree of mutual coherence. 3]). When 1Yt2 ( -r)l 1 for all T and for all r 1 and r 2 , then the light field contains one frequency only. When 1Yt2 (-r)l 0, then the light field must vanish; that is, a completely incoherent light field cannot exist. This can be understood intuitively as follows. Suppose, we have a light source radiating completely incoherent light. 53), we can generate interference phenomena; that is, the light = = 48 4. Coherence shows properties bf coherence.
Geometry for the spatial coherence condition. We observe that the coherence properties of the light field are solely determined by the field at the two apertures. The remaining components are 46 4. Coherence ingredients. The screen, for instance, serves for measuring the intensity of the superposition of the partial waves originating from the apertures. The superposition is done on the screen, but the wave fields of the partial waves there are the same as those at the apertures except for a time shift.