Theory of Laser Oscillation
In Chap. 6 we investigated the output characteristics of the laser with the use of rate equations. In this chapter we shall investigate laser oscillation by taking the phase into consideration, so that the interaction between atoms and laser radiation may be treated not merely as a probability of induced emission but as a coherent interaction. Such theories can be classified into two types: the semiclassical theory in which light is treated as classical electromagnetic waves described by the Maxwell equations, while the behavior of atoms in the electromagnetic field is described quantum-mechanically, and the fully quantum-mechanical theory, in which not only the atoms are quantized but also the light, and both are treated quantum-mechanically.
KeywordsRing Laser Population Inversion Laser Medium Laser Oscillation Combination Frequency
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