The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In the work considered is the Fourier-holography scheme with identical object and reference beams which possesses a self-associative image reconstruction feature, as a signal processing device. Such a device has to be characterized particularly with signal-to-noise ratio (SNR) and a limit of detection (LD). The paper describes an approach that allows deriving the SNR parameter from the known properties...
Here is considered the conception of two-color broadband detectors based on narrow-gap mercury-cadmium-telluride (MCT) thin layers. Two-colour un-cooled and cooled to 78 K MCT thin layers with antennas were considered both as sub-terahertz (sub-THz) direct detection bolometers, and 3 to 10 μm infrared (IR) photoconductors. The design and dimensions of THz detector antennas were calculated for reasonable...
Experimental values of the third-order susceptibility of ultra-thin gold layers are obtained and compared to the values of the third-order susceptibility for bulk gold. The effective enhancement of the third-order nonlinearity depending on the thickness of the gold layers is observed. We discuss possible reason for such enhancement. The two-temperature model is applied to model the nonlinear response...
A possibility to control the gas bubble size in an absorbing liquid through the laser thermo-capillary trapping has been demonstrated. The coarse structure of the observed interference patterns in reflected and transmitted lights are explained qualitatively within the framework of a two-ray approach. The movement of interference fringes can be treated as a manifestation of the Doppler effect because...
We report the results of an experimental study of synthetic opal composed from silica spherical particles. Immersion spectroscopy methods were used to inspect the "photonic forbidden zone" and the peculiarities of Bragg reflection in the material. A temporal response of luminescence from artificial opal excited by nitrogen laser UV pulses at room and liquid-nitrogen temperatures was examined...
Works of art expert examination is a type of activity intended to identify conformity of any work of art to data provided by examination ordering party. The experts examine and analyze work of art for its authenticity, i.e. its conformity to claimed creation time and authorship of a particular artist. Their work results in experts' report which confirms or rejects authenticity of a painting, icon,...
A new method of two-stage excitation of Zn atoms to triplet Rydberg states is proposed. At the first stage of excitation the two-photon transitions are applied within three-level scheme with following relaxation to metastable states, while one-photon transitions to Rydberg states are employed at the second stage.
Using extreme surfaces method we have found the global maxima of linear electro-optic effect for optical path difference in selected crystalline materials which now widely use as working elements in optoelectronic devices. So, for LiNbO3, LiNbO3:MgO, ADP, AD∗P, LiIO3, BaTiO3 and a-HIO3 crystals the magnitudes of global maxima, their angular parameters and relevant application performance enhancement...
Theoretical and experimental investigations of the laser radiation transfer through the scattering suspension of polystyrene micro-spheres in distilled water were performed Dependence of the wavefront aberrations on the turbid medium concentration was obtained. Experimental wavefront measurements and correction were performed. The investigation showed that with the use of bimorph deformable mirror...
The paper describes the results of experimental research of dynamic spectral filtration using polychromatic laser radiation interaction with multi-frequency acoustic wave. Optical radiation sources were three semiconductor lasers operating in the bands of red, green and blue portions of the spectrum and absorption filters — elements simulating the spectral properties of the reflective surfaces of...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.