We consider the use of a Cr3+:BeAl2O4 laser in free-running operating as a source of emission for optical pumping rubidium alkali metal vapors. The use of dispersive elements in the composition of the laser cavity makes it possible to smoothly tune lasing wavelength and to realize generation at wavelengths corresponding to the D1 and D2 lines of the 85Rb and 87Rb isotopes. Optical pumping of rubidium isotopes by laser emission with wavelengths of 795 and 780 nm, respectively, is experimentally implemented, and their fluorescence is demonstrated. The question of using a wavelength-tunable laser in the method of spin-exchange optical pumping of noble gases is discussed.

We consider the use of a Cr3+:BeAl2O4 laser in free-running operating as a source of emission for optical pumping rubidium alkali metal vapors. The use of dispersive elements in the composition of the laser cavity makes it possible to smoothly tune lasing wavelength and to realize generation at wavelengths corresponding to the D1 and D2 lines of the 85Rb and 87Rb isotopes. Optical pumping of rubidium isotopes by laser emission with wavelengths of 795 and 780 nm, respectively, is experimentally implemented, and their fluorescence is demonstrated. The question of using a wavelength-tunable laser in the method of spin-exchange optical pumping of noble gases is discussed.

The authors consider the use of a Cr 3+ :BeAl 2 O 4 laser operating in the mode of free generation as a source of radiation for the optical pumping of vapors of rubidium alkali metal. The use of dispersive elements in the composition of the laser resonator allows smooth tuning of the radiation and generation at wavelengths corresponding to lines D 1 and D 2 of isotopes 85 Rb and 87 Rb. The optical pumping of rubidium isotopes using laser radiation with wavelengths of 795 and 780 nm, respectively, is performed experimentally. The fluorescence of the isotopes is demonstrated. The use of tunable wavelength laser generation in the spin-exchange optical pumping of noble gases is discussed.

A study is performed of the laser ablation of solid targets in a liquid irradiated with microsecond pulses of a tailored solid-state laser. Special attention is given to measuring the laser’s spatial, temporal, and energy characteristics. It is shown that a microsecond laser pulse consists of a train of short pulses with a high rate of repetition that induce the formation of nanoparticles of different sizes.

The method for control of the parameters of laser radiation based on its recording in the diffuse reflecting screen plane and subsequent digital processing of the recorded image is described. The corresponding algorithm for determining the spatial laser beam parameters is presented and implemented in software. Experimental approbation has been performed using a digital high speed video system and a solid-state pulsed-periodic laser on an alexandrite (Cr3+:BeAl2O4) crystal. The proposed method is compared with standardized method of radiation recording by a matrix photodetector.

The article introduces a tunable NIR laser. The tuning process realizes by the dispersion elements placed inside the resonator. Energy parameters depending on the laser operating mode are presented. The possibility of smooth tuning of the fundamental lasing wavelength depending on the rotation parameters of the dispersion element is shown.

The paper describes a method of a beam radiation parameters analysis. Such analysis bases on the laser beam registration in the plane of a diffusely reflecting screen and digital processing of the registered image. The algorithm of the laser beam spatial parameters determination is presented and realized programmatically. The experiment was carried out using a digital high-speed video system and a solid-state pulsed periodic laser based on a Cr 3+ : BeAl 2 O 4 alexandrite crystal. A comparison of the proposed method with a standardized method based on the registration of radiation by a matrix photodetector is presented. The development of measure methods of the laser radiation parameters is necessary due to the appearance of new sources of laser radiation and their use in various applications.

The areas of modern solid-state lasers application for solving technological problems of materials laser processing are described. The mod composition of laser radiation, which is used in various technological processes of materials laser processing, such as perforation, cutting and welding of materials, and others, are analyzed. The necessity of solid-state lasers functional improvement in terms of increasing the efficiency of their practical use is substantiated. A method for the prospective application of lasers for technological purposes is presented, based on the functional separation of the acting laser pulses of millisecond duration. The results of experimental testing of this method on the basis of a solid-state technological YAG: Nd3 + laser are presented. The results of studies of the efficiency of processing materials with different thermophysical properties by laser pulses with a complex temporal shape are presented. The experiments results are analyzed. Potential areas of promising use of this method are noted.

The urgency of laser beam control tasks in various spheres of its application is noted. The algorithm of the coordinate determining of the laser beam geometric and energy centers and its implementation in the package of applications for solving problems of technical calculations MathLab are presented.

The drop deposition of colloidal nanoparticles was performed from water-based colloidal solutions. The proposed procedure is based on the agglomeration of colloidal particles in laser-assisted evaporation processes. The evaporation process was resulted in the formation of clustered thin films on a glass substrate. In the experiments with bimetallic Au:Ag solutions, the clustered films are grown, the formation of the clustered films with the average height of 100 nm was achieved. Optical properties of the deposited structures were investigated experimentally. It is shown that the obtained films may become transparent and its properties are defined by its morphology.

В данной работе приведены результаты экспериментов по измерению вольт-амперных характеристик островковых биметаллических пленок Ag/Au, а так же моделирование электропроводных свойств в перколяционном приближении. Abstract – In this paper, we present the results of experiments on the measurement of the volt-ampere characteristics of Ag / Au island bi-metal films, as well as the simulation of electrically conductive properties in the percolation approximation.

Metal-carbon materials realize surface-enhanced Raman scattering which has been synthesized by laser irradiation of colloidal systems consisting of carbon and noble metal nanoparticles. The dependence of the Raman scattering intensity of the material composition has been investigated. The possibility of detecting of the Raman spectrum of organic dye DCM and Rhodamine 6G was demonstrated.

New metal–carbon composite materials, synthesized by laser irradiation of colloidal systems consisting of carbon and noble metal nanoparticles, are promising objects to realize surface-enhanced Raman scattering. The dependence of the Raman scattering intensity of the material composition has been investigated.

The quantum states verification in cluster semiconductor/metallic structures by jump/tunneling electroconductivity and possible mechanisms for their implementation are considered in experiment and theory. By our laser ablation technique we have nanostructurized the films for which the ability to control the change in their electrical properties does exist by variation of the topology for the system. The granular conductivity specificity has been under study. The current-voltage characteristics behavior has been measured for a nanocluster bimetallic film (Au+Ag), and the experiments for multilayer bimetal thin films of the different composition have been carried out. Two associated mechanisms for electroconductivity occur in the case, i.e. tunnel transition for electrons and electron activation in the frames of the shell model for a cluster system, in dependence on the nanostructure topology.

The drop deposition of colloidal nanoparticles was performed from water-based colloidal solutions. The proposed procedure is based on the agglomeration of colloidal particles in evaporation processes. The evaporation process was resulted in the formation of clustered thin films on a glass substrate. In the experiments with bimetallic Au:Ag solutions, the clustered films are grown, the formation of the clustered films with the average height of 100 nm was achieved. Optical properties of the deposited structures were investigated experimentally. It is shown that the obtained films may become transparent and their properties are defined by their morphology.

A new approach to analyzing the conductivity of metal microcontacts of the fractal type is proposed. It is shown that the resistance of such a microcontact depends strongly on its morphology (total characteristic including the size, shape, and spatial organization, which are determined by atomic force microscopy). A method for calculating the resistance of a microcontact by measuring its height map is proposed.

The optical properties of multilayer bimetallic films composed of silver and gold nanoparticles have been investigated. The dependence of the transmission spectra of the films on their morphology is demonstrated. A finite-difference time-domain (FDTD) simulation has confirmed that there is a dependence of the transmission spectra on the average distance between particles and the number of deposited layers.

Methods of laser modification allow us to observe macroscopic quantum phenomena in nanostructured (cluster) materials. The laser synthesis of nanoparticles/nanoclusters with different topologies in semiconductor PbTe samples is performed via direct laser modification of thin films under the action of continuous laser radiation with a wavelength of 1.06 μm and a power density of ~105 W/cm2. Nanoparticles with bimodal distribution in lateral dimensions are obtained on the surfaces of the samples. The electrophysical properties of such structures can be controlled as desired by modifying their topology. Variations in electric properties depending on the particle location density are demonstrated. The results are interpreted based on the existence of quantum coherent processes with tunneling transitions and hopping conductivity. This approach is promising for the fabrication of elements and devices in optoelectronics and photonics based on new physical principles, and of different hybrid optoelectrical schemes.