В настоящей работе представлены результаты исследований генерации лазера на композитном элементе из Nd3+:YAG/Cr4+:YAG керамики отечественного производства. Композитный элемент, полученный методом реактивного спекания смеси порошков оксидов, состоит из двух частей – активной среды Nd3+:YAG и пассивного лазерного затвора Cr4+:YAG. В режиме пассивной модуляции добротности реализована генерация излучения со средней мощностью 4,2 Вт. При этом длительность и частота следования импульсов составили 4,6 нс и 68,5 кГц соответственно. С использованием исследуемого лазера в работе реализован процесс взаимодействия лазерного излучения с материалом из нержавеющей стали марки AISI 304 в воздушной и в жидкостной средах. В результате лазерного воздействия на поверхности материала образуются кратеры, а жидкость содержит синтезируемые микро- наночастцы. Таким образом, в работе впервые экспериментально продемонстрирована возможность использования лазера на Nd3+:YAG/Cr4+:YAG керамике для обработки поверхности материала и получения наноразмерных частиц на примере абляции нержавеющей стали AISI 304 в жидкости. Полученные в работе результаты могут быть интересны для решения задач технологической микрообработки материалов и получения частиц различной дисперстности. This paper presents the results of studying laser generation on a domestically produced composite element made of Nd3+:YAG/Cr4+:YAG ceramics. The composite element obtained by reactive sintering of a mixture of oxide powders consists of two parts – an Nd3+:YAG active medium and a Cr4+:YAG passive laser shutter. In the passive Q-switching mode, generation of radiation with an average power of 4.2 W was realized. The pulse duration and repetition rate were 4.6 ns and 68.5 kHz, respectively. Using the laser under study, the process of interaction of laser radiation with AISI 304 stainless steel in air and liquid environments was realized in the work. As a result of laser action, craters are formed on the surface of the material, and the liquid contains synthesized micro- and nanoparticles. Thus, the work has experimentally demonstrated for the first time the possibility of using a laser on Nd3+:YAG/Cr4+:YAG ceramics for processing the surface of a material and obtaining nanosized particles using the example of ablation of AISI 304 stainless steel in liquid. The results obtained in the work may be of interest for solving problems of technological microprocessing of materials and obtaining particles of various dispersions.

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.

The work is devoted to the synthesis of nanoparticles in the process of ablation of a copper target in a liquid by repetitively pulsed laser radiation. It has been noted that nanomaterials based on certain metals have unique physical and chemical properties. This ensures their use in various applications. In particular, copper nanoparticles are successfully used in medicine and biochemistry. To carry out the synthesis of copper nanoparticles, a previously developed Cr3+:BeAl2O4 laser is used. The laser is based on a plane-parallel resonator with a dispersive prism. Using a prism, the radiation wavelength is smoothly adjusted. To carry out copper ablation, the laser generation wavelength was tuned to 740 nm. It has been shown that when a target is exposed to a microsecond laser pulse consisting of a train of short pulses, copper nanoparticles of various sizes are formed. Comparison of the results with the results of previous works shows that exposure of the target to radiation with a shorter wavelength, commensurate with the energy density of the train and similar spatial parameters leads to a decrease in the average size of the synthesized nanoparticles.

The synthesis of copper nanoparticles using a pulsed alexandrite laser is demonstrated. The laser operated in a free generation mode with a pulse duration of about 250 μs. The copper target was placed in distilled water and glycerin. The obtained colloidal solutions were investigated by dynamic light scattering, and the deposited structures were studied by atomic force and electron microscopy. The concentration of nanoparticles depended on the power of the laser radiation, the scanning speed and the exposure time. The smallest particles size was obtained at a frequency of 5 Hz at a wavelength of 750 nm. Colloids obtained in distilled water contain copper nanoparticles, which oxidize over time.

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.

This article discusses the possibility of using Lyot interference-polarization tuners to create tunable lasers. The use of various variations and layouts of phase-shifting plates makes it possible to generate both dual-wave and single-wave radiation with the possibility of tuning. The tuning range depends both on the specific type of tuner used and on the parameters of the cavity and active medium. Dual-wave and single-wavelength generation of an alexandrite laser is demonstrated.

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.

This paper shows the possibility of the use of a solid-state alexandrite laser as a radiation source for the method of spin-exchange optical pumping of noble gases (xenon, krypton). The use of dispersive optical elements in the laser cavity will allows the adjusting of the radiation wavelength exactly in the rubidium spectral absorption lines 794.7 nm and 780 nm. To obtain a hyperpolarized state of noble gases, it is necessary to excite rubidium atoms for further spin-exchange process with the noble gas nuclei. This fact will allow the increasing of the magnetic resonance imaging contrast in the field of diagnosis of respiratory organs diseases.

Abstract This paper discusses the use of dispersive optical elements as control devices for the wavelength of alexandrite laser. Some types of selective resonators are considered. The losses in the resonators with dispersive elements are described. The results of a dual-wavelength alexandrite lasing with an installed birefringent filter are presented.

Abstract The gold and silver plasmon nanoparticles have been synthesized on the c-sapphire and p-silica substrates by the pulsed laser deposition method. It has been demonstrated that the variation of the thickness of as-grown gold and silver films permits producing the plasmon nanoparticles with different size and density. It provides the retuning of the frequency of surface plasmon resonance in wide spectral region.

This article is devoted to the process of remote exposure to the radiation of fiber laser on metal shell explosive objects. The advantages of fiber lasers that allow their use in demining complexes are described. The paper presents an experimental study of the effect of fiber laser radiation profiled and non-profiled pulses on metal simulators of explosive objects. It is established that the effect of profiled pulses compared to the non-profiled allows to significantly reduce the melting time of the sheath and to decrease the required laser energy.