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We give explicit results for a gedanken experiment with very cold atoms. In all cases we analyze the possibilities of various approximations which can be made, and show the limits and validity of the Fraunhofer approximation both in space and in time.

Then we analyze in detail diffraction at an edge, both in space and in time, of a single slit in space and in time, a double slit in space, and a single slit in time, a single slit in space and a double slit in time, and, finally, a double slit both in space and in time.

We then investigate in detail the simultaneous diffraction both in space and in time representing a general solution. Specific cases of diffraction in time investigated here are diffraction at an “edge in time” and a Fresnel lens in time. DIFFRACTION OF WAVES lecture notes and quetions west herts: extended degree in science diffraction of waves what is diffraction when waves travel through. However, the waves spread out to some extent into the area beyond the gap. Diffraction in time appears for Schrödinger waves and not for light in vacuum. Diffraction When waves meet a gap in a barrier, they carry on through the gap. In the present paper we investigate this phenomenon starting from a Green’s-function approach. In analogy to the well-known diffraction of waves at spatial structures, one can also define diffraction in time when a wave is temporarily modulated.