By Emil Wolf
This quantity comprises six assessment articles facing issues of present study curiosity in optics and in similar fields. the 1st article bargains with the so-called embedding process, which has discovered important functions within the learn of wave propagation in random media. the second one article provides a evaluation of an enticing type of non-linear optical phenomena that have their starting place within the dependence of the complicated dielectric consistent of a few media at the mild depth. those phenomena which come with self-focusing, self-trapping and self-modulation have came upon many functions, for instance in fibre optics units, sign processing and computing device expertise. the subsequent article is anxious with hole solitons that are electromagnetic box buildings which could exist in nonlinear media that experience periodic edition of their linear optical homes, with periodicities of the order of the wavelength of sunshine. either qualitative and quantitative descriptions of hole solitons are offered and a few experimental schemes for his or her detection within the laboratory are mentioned. The fourth article describes tools for the selection of optical part from phase-modulated photographs. those tools have stumbled on purposes in plasma diagnostics, in reference to movement characterisation and within the layout of latest optical tools. the ultimate article stories advancements in relation to imaging, via turbulence within the surroundings. It appears on the cutting-edge of our knowing of this topic and discusses an important tools which are shortly hired to atone for photograph distortion because of atmospheric turbulence.