Quantum electronics can be defined as that branch of electronics where phenomena of a quantum nature play a fundamental role. This book will deal with a particular aspect of quantum electronics, namely, the physical principles of lasers and their behavior. Before going into a detailed discussion of the subject, it seems appropriate to devote a little space to an explanation, in a very simple way, of the ideas behind the laser.
KeywordsActive Material Spontaneous Emission Population Inversion Spatial Coherence Coherence Time
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