Introduction. References. Chapter 1 Low-order harmonic generation of laser radiation in various media. 1.1. Nonlinear crystals. 1.2. Fullerene-doped polyimide films, Fe- and Z-doped polyvinylpyrrolidone, colloidal metals solutions and organic dyes. 1.3. Plasma and ionic media. 1.4. Gases. 1.5. Low-order harmonic generation during interaction of laser radiation with surfaces. References. Chapter 2 High-order harmonic generation from...