Abstract
As has been mentioned in Chap. 1, the quality of OPC by SS is high when the pump field has a developed speckle structure in the interaction volume. Here we shall try to explain what a speckle structure is, under what conditions it is observed, and what properties the speckle fields possess. It is vary easy to see a speckle structure: a wall surface, a sheet of paper and, in general, almost any object illuminated by a laser beam looks to be covered with a large number of irregular bright speckles. Their positions change as the position of the observer, the light source, or of the object itself changes. Figure 3.1 presents a photograph of a speckle-field section.
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Zel’dovich, B.Y., Pilipetsky, N.F., Shkunov, V.V. (1985). Properties of Speckle-Inhomogeneous Fields. In: Principles of Phase Conjugation. Springer Series in Optical Sciences, vol 42. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-38959-0_3
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DOI: https://doi.org/10.1007/978-3-540-38959-0_3
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