This book is a tribute to E.L. Hahn, an outstanding physicist whose discovery of spin echoes and demonstration of nuclear free induction decay led to the most important methods of modern nuclear magnetic resonance. The wide impact of these methods in physics, chemistry, biology, and medicine is fully acknowledged. In addition, Hahn's fundamental contributions in nuclear quadrupole echo phenomena, level crossing techniques, self-induced transparency and laser physics have been of paramount importance. Reflecting the diversity of these key discoveries and their vital influence, the articles...