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Showing papers on "Light field published in 1973"


Journal ArticleDOI
TL;DR: In this paper, the intensity autocorrelation function for the depolarized component of forward-scattered light from a solution of large polymeric molecules is derived in terms of the correlation function for amplitudes of the Y2,±1(θ,ϕ) fluctuations in the anglar distribution of segments in the solution without any assumptions regarding the statistical properties of the scatterad light field.
Abstract: The intensity autocorrelation function for the depolarized component of forward-scattered light from a solution of large polymeric molecules is derived in terms of the correlation function for the amplitudes of the Y2,±1(θ,ϕ) fluctuations in the anglar distribution of segments in the solution without any assumptions regarding the statistical properties of the scatterad light field. Effects arising from the use of polychromatic incident light and from the mixing of the scattered and polychromatic incident light beams are examined in detail. Apparatus for observing the depolarized forward-scattered light, digitizing and storing the fluctuating phototube current at rates from 10 to 540,000 times per second, and computing the correlation functions directly in the time-domain is described herein. Correlation functions were obtained for 0.05 mg/ml solution of tobacco mosaic virus at pH 9.1 and also at pH 6. The degree of association of the virus appears to be independent of pH, and the monomer relaxation times (corrected to 25°C) extracted from the data by a least-squares procedure lie in the range 0.44–0.49 msec, also independent of pH. The absence of faster component in the correlation function between 6 μsec and 0.5 msec is used in conjunction with thermal fluctuation theory to infer a lower limit for the effective Young's modulaus of the rod, E ≤ 2.5 × 107 dynes/cm2.

66 citations


Journal ArticleDOI
TL;DR: In this paper, the spatial coherence factor associated with the intensity correlation function of light scattered from N independent particles was derived, and the so-called cross-spectral purity condition is valid in this case.

9 citations


Journal ArticleDOI
TL;DR: In this paper, the authors derived a set of nonlinear wave-equations for the field and exciton amplitude and the exciton occupation number for both pulse propagation and giant polaritons in crystals.
Abstract: Starting from a Hamiltonian which describes the interaction of the many-electron system of a crystal with the quantized light field, we derive a set of nonlinear wave-equations for the field and exciton amplitude and the exciton occupation number. Our treatment comprises both Frenkel and Wannier excitons. Our equations form a sound basis for treating both pulse-propagation phenomena and giant polaritons in crystals.

7 citations


Journal ArticleDOI
TL;DR: In this paper, three models of nongaussian stationary light are studied in which the clipped photocount autocorrelation formulae at zero photon number are not simply connected to the unclipped auto-correlation intensity function of the light field.
Abstract: Three models of nongaussian stationary light are studied in which the clipped photocount autocorrelation formulae at zero photon number are not simply connected to the unclipped autocorrelation intensity function of the light field.

5 citations


Journal ArticleDOI
TL;DR: This paper endeavors to generalize the empirical relationships of photometry to a light field of complex structure and to describe this light field in terms of the electromagnetic theory of light.
Abstract: This paper endeavors to generalize the empirical relationships of photometry to a light field of complex structure and to describe this light field in terms of the electromagnetic theory of light.

3 citations


Book ChapterDOI
H. Risken1
01 Jan 1973
TL;DR: The statistical properties of laser light have been investigated both theoretically (e.g. as mentioned in this paper ) and experimentally in great detail, and the theory is rather simple and it agrees with experiments very well.
Abstract: The statistical properties of laser light have been investigated both theoretically (e.g. [1–20]) and experimentally (e.g. [21–30]) in great detail. For a single mode laser not too far from threshold the theory is rather simple (it is essentially governed by only one parameter) and it agrees with experiments very well. In the experiments [21–30] only the statistical properties of the intensity are compared with the theory. Measurements giving information on the statistical properties of the phase of the light field, for instance the usual linewidth, have been made in the threshold region only quite recently [31], see fig. 1.