Abstract
It is shown that the quantum noise properties of the electromagnetic field from a laser oscillator can be derived from classical models. A first model is based on a loaded L-C circuit driven by Gaussian noise sources that are quantum generalizations of Nyquist noise sources. A second model is based on rate equations and shot-noise sources. With each of these models specific correlation functions of the field variables of the laser oscillator are derived. The equivalence of these models with the quantum theory is shown by a fully quantized treatment of the laser oscillator in the operator noise-source formalism. Some of the results are discussed and compared with results published by other authors.
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