Semi-classical theory of quiet lasers. I: Principles

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dc.creatorArnaud, Jacques
dc.creatorChusseau, Laurent
dc.creatorPhilippe, Fabrice
dc.date2006-10-13
dc.date2007-01-22
dc.date.accessioned2026-07-07T07:42:00Z
dc.date.available2026-07-07T07:42:00Z
dc.descriptionWhen light originating from a laser diode driven by non-fluctuating electrical currents is incident on a photo-detector, the photo-current does not fluctuate much. Precisely, this means that the variance of the number of photo-electrons counted over a large time interval is much smaller that the average number of photo-electrons. At non-zero Fourier frequency $Ω$ the photo-current power spectrum is of the form $Ω^2/(1+Ω^2)$ and thus vanishes as $Ω\to 0$, a conclusion equivalent to the one given above. The purpose of this paper is to show that results such as the one just cited may be derived from a (semi-classical) theory in which neither the optical field nor the electron wave-function are quantized. We first observe that almost any medium may be described by a circuit and distinguish (possibly non-linear) conservative elements such as pure capacitances, and conductances that represent the atom-field coupling. The theory rests on the non-relativistic approximation. Nyquist noise sources (in which the Planck term $\hbarω/2$ is being restored) are associated with positive or negative conductances, and the law of average-energy conservation is enforced. We consider mainly second-order correlations in stationary linearized regimes.
dc.description116 pages Second draft of a book project. To be completed by a part II incuding extended details on application of the theory
dc.identifierhttps://arxiv.org/abs/quant-ph/0610106
dc.identifierhttp://arxiv.org/abs/quant-ph/0610106
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/122329
dc.subjectQuantum Physics
dc.titleSemi-classical theory of quiet lasers. I: Principles
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