ABSTRACT
The non-linear optics of the surface of semiconductors widely uses the concepts, ideas and methods of solid-state physics, especially the physics of semiconductor crystals. Many of the problems of non-linear optics can not be solved without using the knowledge of areas such as crystallography, band theory, the statistics of charge carriers in equilibrium and non-equilibrium media. In some non-linear optical studies it is necessary to use the results of continuum mechanics (elasticity theory), the kinetics of electron processes in the semiconductors, crystal optics, etc. Of course, these sections have been well studied, information on them is described in the well-known monographs and textbooks. The physico-chemical properties of silicon has also been well studied and described in the literature, probably better than the properties of any other semiconductor.
