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Il Nuovo Cimento

On the classical fluctuation of a beam of light

Lajos Jánossy

Published Jul 1, 1957• 32 citations
Publisher
DOI
10.1007/bf02827762

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In this paper, we have shown that the mathematical expressions for a new integrated quantum optical system which encompass laser light and twin light beams.Our finding shows that the quadrature variance and quadrature squeezing for the superposed light beam is the sum of the quadrature variance and the average of the quadrature squeezing of the component systems respectively.We also found that the presence of the twin light beam improves the non-classicality of the system.Keywords： Laser Light, Quadrature Fluctuation, Squeezing, Twin Light Beams
The paper contains a quantum theoretical analysis of laser beam fluctuations and of the light beat experiments with two lasers. With the help of experimental results on photon counting fluctuations in a single-mode laser field, some correlation properties of the field are derived. It is shown that the correlation equations are satisfied by states of the field which are much more general than "coherent" states. The equations lead directly to the spectral density of the intensity operator in the light beat experiments, which can be obtained from photoelectric measurements. The resulting expression is practically identical to that found by Forrester for light having thermal statistical properties. The reasons for this are discussed by a comparison of the corresponding probability distributions of photon counts and of the classical wave amplitude.
The behaviour of a two-level atom saturated by a resonant fluctuating laser beam is studied. A classical description of the light wave is used, corresponding to a laser well above threshold. Two different approximations are introduced for treating the effects of slow and fast fluctuations; slow fluctuations are followed adiabatically by the atom and fast fluctuations appear as a relaxation mechanism for the population difference and for the optical dipole moment obeying the motional-narrowing condition. The perturbation of the spectral distribution of the fluorescence light is determined quantitatively and the great sensitivity of this spectrum to higher order correlation functions of the light wave is exhibited.