摘要: The subject of electromagnetism in the presence matter is both extensively studied and rich diverse phenomena. It spans such topics as quantization electromagnetic field to semiclassical treatment light-matter interactions derivation Fresnel reflectivity formulas. Interest femtosecond optics rooted nonlinear optical phenomena complex electron lattice dynamics that occur a material following intense ultrashort-pulse irradiation. experiments we discuss this paper are concerned mainly with latter lie at intersection between materials science.