Energy flows in polychromatic fields are considered. It is shown that for fields obtained as a result of the superposition of two waves with different frequencies with an analysis time shorter than the beat period, the behavior of the characteristics of the Poynting vector and angular momentum depend on the intermodulation components of the instantaneous vector. The Stokes parameters in this case determine not the state of polarization, but rather the value of the spin angular momentum. The magnitude of the Poynting vector modulus depends on the structure of the analyzed field and for fields of general form is at a level of 20% of the value observed for a coherent wave. Computer simulation data are presented.
The article proposes a new method for the formation of polychromatic edge dislocations with the aim of synthesizing radially and azimuthally polarized polychromatic beams. The proposed method is based on the use of computer-generated hologram technology. It has been shown that using this technology allows to obtain polychromatic edge dislocations with characteristics independent of the spectral composition of the radiation. The results of computer simulation and experimental investigation are presented, confirming the possibility of transforming smooth polychromatic beams into edge dislocations.
This paper introduces an automatic system for maintaining the zero interference band in interferometric measurements. It facilitates precise measurements of maximum (Imax) and minimum (Imin) intensities across the investigated area for interference pattern visibility. The system employs a piezoceramic modulator for interference fringe generation, synchronized detectors for simultaneous Imax and Imin registration, and automatic phase control to ensure phase coherency. This system enhances measurement accuracy and efficiency, finding applications in interferometric experiments involving phase-inhomogeneous objects and dispersive media.
This work is aimed at generalizing the methods of laser polarimetry in the case of partially depolarizing optically anisotropic methyl acrylate layers. A method of differential Mueller-matrix mapping is proposed and substantiated for reproducing the distributions of the parameters of linear and circular birefringence and dichroism of partially depolarizing methyl acrylate layers.
This work is aimed at generalizing the methods of laser polarimetry in the case of partially depolarizing optically anisotropic polymer layers. A method of differential Mueller-matrix mapping was proposed and substantiated for reproducing the distributions of the parameters of linear and circular birefringence and dichroism of methyl acrylate layers under various temperature conditions (200 ‒ group 1) and (450 ‒ group 2).
The article presents the results of determining the possibilities of the polarization-singular approach to improve the efficiency of Mueller-matrix polarimetry in the differential diagnosis of polycrystalline structure of optically transparent polycarbonate layers. The relationship between the characteristic values of the elements of the Mueller matrix and polarization-singular L - states of microscopic images of polycrystalline structure of optically transparent polycarbonate layers was determined. A technique for the experimental determination of the distributions of the characteristic values of Mueller-matrix images has been developed and tested. Statistical criteria for express differential diagnosis of polycrystalline structure of optically transparent polycarbonate layers with different mechanical stresses were determined.
The article presents the results of the formation of a polychromatic edge dislocation. A complex Bragg hologram formed as a complex of two gratings with similar characteristics is used as a device employed for this purpose. It is shown that, under resonant illumination of such a grating in the direction of the zero order, two waves are formed with practically equal intensities, forming a low-frequency interference pattern, at the minima of which edge dislocations are observed. The main idea of the method for the formation of a polychromatic edge dislocation is that such a grating is illuminated by a converging radiation beam with a sufficiently wide spectrum. In this case, the structure itself chooses the resonance angles of illumination of the hologram, and identically localized partial spectral gratings are formed in the zero order. The data of experimental studies are presented. The discussion considered the prospects for the formation of polychromatic azimuthally and radially polarized beams
The purpose of the work was to demonstrate the possibility of optical diagnosis in the consideration of sexually transmitted infections in the development of inflammatory processes of the cervix using spectral and polarization methods. Comparison of cervical specimens with and without coilocytosis, irradiated with a range-shifted polarized radiation, showed significant differences in the values of linear dichroism and its spectral dependences. The difference between the coilocyte response characteristic in the range 400-420 nm was calculated using computer programs. As a result, the use of spectropolarization studies and the fluorescence method will improve the accuracy of patient selection for a costly procedure - high-carcinogenic DNA diagnostics of HPV by the standard method of polymerase chain reaction.
The aim of this work is to improve the diagnosis of cervical cancer by introducing laser polarimetry and spectro polarization methods of investigation. We have proposed a novel approach for the differentiation of squamous cell carcinoma and cervical adenocarcinoma using laser optics. Obtained by the method of laser polarimetry by Stokes parameter S4 of native smear with adenocarcinoma of the cervix and squamous cell carcinoma, as well as scraping of the mud canal with endometrial adenocarcinoma and flat cell cancer allows to reliably differentiate the norm from cancer in the native smear and adenocarcinoma from the flat cell cancer in the smear-imprint. The method of spectropolarimetry allows reliably accurately distinguishing the normal epithelium of the cervix from cancer of the cervix, and the parameters of linear dichroism during the spectropolarization study, reliably (р=0,001) differentiate between normal, adenocarcinoma and flat cell cancer of the cervix.
The current state and prospects of development of methods of obtaining and analyzing images of the retina in important eye diseases and systemic diseases have been considered and analyzed. A method of fractal analysis of the retinal image based on the k-mean algorithm for the task of computer diagnostics and automated screening of hypertensive retinopathy has been developed and tested. The coefficients of wavelet decomposition of images of pathological conditions of the retina in angiopathy, macular degeneration, retinal degeneration and hypertensive retinopathy were calculated. An algorithm for finding the uncertainty of the quantitative values of the maximum modules of the wavelet decomposition coefficients in the presence of distorting obstacles is proposed.
The possibility of formation of the beam with edge dislocation, which is similar to the ТЕ01(10) beam is considered. It is shown that such mode may be obtained due to the diffraction of plane wave on the complex Bragg hologram, constructed as composition of two grating recorded on the same place of registration media. These partial holograms are implemented as the gratings with constant period and close characteristics. The conditions of such operation are formulated. The experimental results are presented.
The possibility of formation of the beam with edge dislocation, which is similar to the ТЕ01(10) beam is considered. It is
shown that such mode may be obtained due to the diffraction of Gaussian beam on the special binary computer generated
hologram. The conditions of such operation are formulated. The experimental results and results of computer simulation
are presented.
In the paper, we take it into one's head to show how different parameters of an optical wave are connected and what follows from this connection. The results of computer simulation are presented.
The connection between contrast changes of intensity distribution of speckle pattern, obtained for polychromatic
illumination of scattering object and coherence characteristics of wave is considered. It is shown, that changes of mean
contrast of speckle field (from center of pattern toward the periphery), obtained for quasimonochromatic illuminating
wave may by connected with spectral range of the wave. The experimental results are presented.
The connection between vortex network and network of stationary points of intensity is considered. It is stated that most of current gradient lines of intensity with the origin in saddle points are positioned in the areas where phase changes quickly. The results of computer simulation are presented. The technique for determining the vortex sign in the scalar fields (including the statistical ones) under conditions when the use of the regular reference beam is impossible is described. The elaborated approach is based on the shift-interferometry technique. The conditions of the optimal vortices identification are formulated. The results of the computer simulation and experimental confirmation are presented.
The connection between vortex network and network of stationary points of intensity is considered. It is stated that most
of current gradient lines of intensity with the origin in saddle points are positioned in the areas where phase changes
quickly. The results of computer simulation are presented.
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