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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Stimulated diffusion light scattering on variations of particles concentration in liquids

I. S. Burkhanov, Leonid L. Chaikov

Published Dec 17, 2013• 3 citations
Publisher

Abstract

The effect of the form change of the intensity correlation function of light scattered back by emulsion or suspension of the particles in liquids is obtained experimentally, when the exciting light intensity increase. The change consists in the appearing in the correlation function of the cosine component with frequency equal to inverse relaxation time of particles concentration fluctuations. The appearance of such cosine component tells about the appearance of the additional spectral line, shifted with respect to exciting light by the half-width of the spectral line of spontaneous polarized Rayleigh scattering by particles. The cosine is caused by beating between exciting radiation and this spectral line. This frequency shift is of about 25-250 Hz depending on particles sizes and characteristic of liquid, in which they are weighted. Together with the scattering relative intensity increase the cosine appearance confirms the obtaining of the stimulated light scattering at variations of the particles concentrations.

DOI
10.1117/12.2047603

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The effect of the form change of the intensity correlation function of light scattered back by emulsion or suspension of the particles in liquids is obtained experimentally, when the exciting light intensity increase. The change consists in the appearing in the correlation function of the cosine component with frequency equal to inverse relaxation time of particles concentration fluctuations. The appearance of such cosine component tells about the appearance of the additional spectral line, shifted with respect to exciting light by the half-width of the spectral line of spontaneous polarized Rayleigh scattering by particles. The cosine is caused by beating between exciting radiation and this spectral line. This frequency shift is of about 25-250 Hz depending on particles sizes and characteristic of liquid, in which they are weighted. Together with the scattering relative intensity increase the cosine appearance confirms the obtaining of the stimulated light scattering at variations of the particles concentrations.
The change in the shape of the correlation function of the intensity of light scattered by particles in liquid, i.e., the appearance of a cosine component, with increasing excitation radiation intensity, is observed. The amplitude of this component increases with the intensity of exciting radiation. A quadratic component appears in the dependence of the scattering intensity on the exciting radiation intensity. These results point to the appearance of stimulated “diffusion” scattering by particle concentration fluctuations.
A nonlinear growth of the light scattering intensity has been observed and the frequency shift of the spectral line of scattered light has been measured in light backscattered in suspensions of diamond and latex nanoparticles in water. The shift corresponds to the HWHM of the line of spontaneous scattering on particles. We may conclude that there exists stimulated concentration (diffusion) light scattering on variations of the particle concentration, which is also called the stimulated Mie scattering. In a fibre probe scheme, the growth of the shift of the scattered spectral line is observed with an increase in the exciting beam power. The variation of the frequency shift with an increase in the exciting power is explained by convection in liquid.
It was recently shown that, when light is scattered from a random medium whose response function (e.g., the dielectric susceptibility) has appropriate correlation properties, the spectrum of the scattered light may be frequency shifted with respect to the spectrum of the incident light.1,2 In general the relative frequency shifts produced by this mechanism will be different for different spectral lines. We show that under certain circumstances the relative shifts generated by scattering from appropriately correlated space-time fluctuations may become frequency independent and may be arbitrarily large. This scattering mechanism then imitates the Doppler effect, even though the source, the scattering medium, and the observer are at relative rest with respect to each other.
When a high-intensity laser beam passes through a transparent and homogeneous optical medium, the induced light scattering may manifest the properties of stimulated radiation characterized by threshold requirement, high directionality, and high brightness. This is the stimulated scattering of intense coherent light. Discoveries and studies of various types of stimulated scattering effects have provided a much deeper and more comprehensive understanding of interactions between the intense coherent light and matter. On the other hand, devices based on stimulated Raman scattering, stimulated Brillouin scattering, and stimulated spin-flip Raman scattering can be employed as highly efficient tunable frequency shifters of coherent light. Stimulated Kerr scattering can be used to generate a super-broadband coherent light and to investigate the molecular anisotropy of liquids. In addition, the recently developed stimulated Rayleigh–Bragg scattering and stimulated Mie scattering can significantly reduce the threshold requirement, and provide a highly efficient no-frequency-shift optical phase conjugation wave.
We have studied the amplitude and temporal correlations of intensity fluctuations of multiply scattered light transmitted through a colloidal suspension. When the coherence length lc{\mathit{l}}_{\mathit{c}}lc​ of the incident light becomes comparable to the width of the probability distribution of photon-path lengths, both the amplitude and dynamics of intensity fluctuations become functions of lc{\mathit{l}}_{\mathit{c}}lc​. In this article we present a simple theory that relates these coherence effects to the photon path-length distribution P(L). We have tested this theory using P(L) calculated from computer simulations and from the diffusion approximation, and find that our theory qualitatively accounts for the observed dependences on coherence length. Our results indicate when the effects of finite laser coherence must be taken into account in quasielastic multiple scattering. In the few-scattering regime of quasielastic multiple scattering, we find that the intensity autocorrelation function generally has a stretched-exponential form, and we discuss the origin of this behavior.
In this work, the normalized time auto-correlation function of the electric field of the light g(1)(τ)g^{(1)}(τ)g(1)(τ) that is scattered by the two kinds of particles in dispersion is investigated. The results show that the logarithm of g(1)(τ)g^{(1)}(τ)g(1)(τ) can be consistent with a line and many reasons can cause the deviations between an exponentiality and plots of g(1)(τ)g^{(1)}(τ)g(1)(τ) as a function of delay time τττ. The nonexponentiality of g(1)(τ)g^{(1)}(τ)g(1)(τ) is not only determined by the particle size distribution and scattering angle but also greatly influenced by the relationship between the concentrations, mass densities and the values that the refractive index of the material expands as a function of the concentration of the two kinds of particles.