It is first system book from Relaxed Optics, new chapter of modern physics of irreversible interaction light and matter. Basic concepts (chronological-energetic classification, electromagnetic classifification, which is based on Pointing tensor, and coherent structures) are represented. Some experimental data, including laser implantation and laser annealing, and corresponding mathematical and physical theories and models are analyzed. Basic applications (optoelectronics, art, architecture) and perspectives of development of Relaxed Optics are discussed too. For physicists of all specialities.