The theoretical analysis of the light induced mass transport task was executed in the nanosuspension in a homogeneous light field. As a result of the analytical solution of the light induced mass transport task it was obtained an expression for the deflection angle of the beam in a pseudo-prism. The using of high intensities of the reference beam allows significantly increase the efficiency of the beam deflection method. The results are relevant in the study of the dispersed liquid media, as well as optical diagnostics of such materials.
A theoretical model of the pseudo-prism method for diagnostics of two-component media in a gravitational field is considered. An expression is obtained for the angle of deflection of the probe signal with allowance for the Dufour effect.
The theoretical analysis of the light-induced mass transport task was executed in the dispersed medium in a homogeneous light field. We have discussed the model of sedimentation of nanoparticles by using the laser effect in liquid. It was received the solution of one-dimensional task of the light induced mass transfer as depending on intensity of laser beam. The proposed model of sedimentation of nanoparticles is relevant in the study of dispersed liquid-phase media, as well as in the optical diagnostics of such materials.
We have discussed the theoretical model of sedimentation of nanoparticles by using the laser effect in liquid. It was received the steady-state solution of one-dimensional task of the light induced mass transfer as depending on intensity of laser beam. It is shown that it can allow to divide polydispersive mixtures. The proposed model of sedimentation of nanoparticles is relevant in the study of dispersed liquid-phase media, as well as in the optical diagnostics of such materials.
This paper proposes a way to create pseudo-prisms in the nanodispersive liquid through the light radiation pressure. The theoretical analysis of the light induced mass transport task was executed in the nanosuspension in a homogeneous light field. As a result of the analytical solution of the light induced mass transport task it was obtained an expression for the deflection angle of the beam in a pseudo-prism.
Thermal lens technique is widely used for the optical diagnostics of materials. The light-induced thermal lens in a homogeneous fluid is formed as a result of thermal expansion of a medium. In two-component fluid the heat flow also can cause concentration stream arising from occurrence of thermodiffusion (Soret effect). Another mechanism of optical nonlinearity of the medium is due to the forces operating on the particles of the dispersed phase in gradient light field. This paper analyzed the two-dimensional diffusion in the nanosuspension with two nonlinearities in a Gaussian beam radiation field. The light induced lens response is analyzed in the two-beam scheme when the reference and signal beams are of different wavelengths. As a result of the exact analytical solution of the problem the expression for the twocomponent medium lens response is achieved. The results are relevant to optical diagnostics of dispersed liquid materials, including the thermo-optical spectroscopy.
Nonlinear optical techniques are widely used for the optical diagnostics of materials. The thermo-induced pseudo-prism method is used to study of the two-component materials. It is measured the angle of the light beam in the material with the thermo-induced refractive index gradient. This paper proposes a way to create pseudo-prisms in the nanodispersive liquid through the light radiation pressure. In the dispersed environment there is a specific mechanism of optical nonlinearity based on the redistribution of the dispersed particle concentration in the light field. The theoretical analysis of the light induced mass transport task was executed in the dispersed medium in a homogeneous light field. As a result of the analytical solution of the light induced mass transport task it was obtained an expression for the deflection angle of the beam in a pseudo-prism. The results are relevant in the study of the dispersed liquid media, as well as optical diagnostics of such materials.
We have theoretically studied the optical transmittance response of thin cell with liquid containing absorbing nanoparticles in a Gaussian beam field. The transmittance spatial changing is caused by thermal diffusion phenomenon (Soret effect) which produces the variations of concentration of absorbing nanoparticles. The thickness of optical cell (including windows) is significantly less than the size of the beam. As a result, an exact analytical expression for the one dimensional thermal task is derived, taking into account the Soret feedback that leads to the temperature rising on the axis of a Gaussian beam. We have experimentally studied this phenomenon in carbon nanosuspension.
The thermal lens scheme is proposed for a thin layer of two-component liquid in the cell which thickness is significantly less than the size of the beam. As a result, an exact analytical expression for the thermal lens response is derived, taking into account the thermal lens in the windows of the cell.
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