By Professor Dr. Dr. h.c. Hermann Haken (auth.)
This e-book, written via one of many pioneers of laser concept, is now thought of a vintage through many laser physicists. initially released within the prestigious Encyclopedia of Physics sequence, it truly is now being republished in paperback to make it to be had not just to professors and scientists, but additionally to scholars. It offers a radical remedy of the idea of laser resonators, the quantum thought of coherence, and the quantization of electromagnetic fields. Especial emphasis is put on the quantum-mechanical remedy of laser gentle via quantum-mechanical Langevin equations, the density matrix equation, and the Fokker-Planck equation. The semiclassical method and the speed equa tion strategy also are offered. the foundations underlying those techniques are used to derive the appropriate equations, from which, in flip, some of the houses of laser gentle are derived. Preface. the idea that of the laser got here into lifestyles greater than a decade in the past whilst SCHAWLOW and TOWNES confirmed that the maser precept should be prolonged to the optical sector. for the reason that then this box has constructed at an immense speed which hardly ever anyone can have foreseen. The laser became out to be a gathering position for such varied disciplines as optics (e. g. spectroscopy). optical pumping, radio engineering, stable country physics, gasoline discharge physics and lots of different fields. The underlying constitution of the laser idea is very simple.