Numerical investigations of the dependences of the output characteristics of the ion strontium vapor laser on the pressure and temperature of the active medium were carried out. Based on the results of calculations, a range of conditions for the excitation of the active medium was found for the realization of the multiwave lasing regime on visible and infrared transitions of the strontium ion (λ=430.5; 416.2; 1091 and 1033 nm SrII). A number of patterns were revealed that are inherent in the active medium of a strontium vapor laser, and the physical mechanisms that determine them were established. The investigations results provide a possibility to choose the conditions for optimal excitation of multiwave strontium vapor lasers, as well as to control the relative contribution of various spectral components to the output radiation.

Keywords: multiwave radiation, recombination pumping, self-termination transition, strontium vapor laser, numerical modeling

This paper describes the process of the flight of powder particles when departing from a nozzle during laser deposition under the influence of an electrostatic field created by electrostatic lenses. Electrostatic force acting on charged particles, interaction between particles, dipole interaction with a field, and gravity are taken into account.

Keywords: simulation, laser cladding, gas powder flow control, electrostatic lens, focusing

Possible methods of high-speed control of the output characteristics of recombination He-Sr and He-Ca lasers using mathematical models are analyzed. The capability is demonstrated of wide-range control of laser output characteristics with the help of two methods – by varying the amplitude of the additional current pulse imposed on early afterglow of the pulse-periodic discharge and by varying the moment of this pulse imposing. The dependences of the laser output characteristics on the parameters of the additional current pulses are numerically calculated. The mechanism of their influence on the population of laser levels is established. The results obtained make it possible to purposefully form control current pulses for the recombination metal vapor lasers.

Keywords: recombination metal vapor laser, He-Sr-laser, He-Ca laser, gas-discharge plasma, fast controlling, mathematical modeling

An analysis of the mechanisms limiting the growth of the output characteristics of ion recombination He-Ca lasers with an increase in the active medium volume and frequency of pulse repetition is carried out. It was established that by a growing laser tube diameter and a growing frequency of pulse repetition the average power of He-Ca lasers saturates and then decreases due to the formation of radial non-uniformity of the active medium as a result of its overheating on the axis and of the radial cataphoresis, as well as because of the raise of the electron temperature level in early afterglow, conditioned by the grow of gas temperature. It is pointed out that as possible ways of increasing the output characteristics can be used the blackening of the laser tube surface, the use of an independent input of calcium vapours, the use of a forced cooling, while the application of a tube with rectangular cross-section will allow to maximally increasing the energy characteristics. Based on numerical computations it is shown that the attainable maximum of running power of He-Ca lasers amounts to: ~ 4.4 W/m for self-heating active elements from BeO-ceramics and ~ 5.2 W/m – on blackening their surface; ~ 5.3 W/m for an independent calcium vapours input and ~ 6.2 W/m – for its combination with blackening; ~ 9.5 W/m for an intensive forced cooling of active elements with cylindrical geometry; ~ 16 W/m – with active elements of rectangular cross-section at a ratio of wall sizes 1:3.

Keywords: metal vapor laser, the ion recombination He-Ca laser, pulse-periodic discharge, gas-discharge plasma, self-heating regime, mathematical modeling

One of the most important advantages of the ion lasers based on the ion transitions of metal vapors and noble gases, is the high quality of radiation (high monochromaticity and coherence). However oscillation on each of active media takes place on restricted number of laser transitions. The purpose of this work is receiving a laser radiation at the same time on several quantum transitions in the wide range of wavelengths when using mix of several active mediums. That increases a set of the laser lines radiated by one laser. The characteristics of ion laser transitions (gain, power, noise level) are substantially improved if a hollow cathode transverse-type discharge is used for pumping of the laser transition, and such method of a pumping was used in this work. It was experimentally found the discharge conditions providing various ratio of laser output power on various laser lines for laser on mixture of helium with cadmium and mercury vapors in which the population inversion and laser oscillation are carried out on mercury ion transition with the wavelengths of 615nm (red), and on cadmium ion transitions with the wavelength of 533,7&537,8nm (green) and 441,6nm (blue), and also for laser on mixture of helium with mercury vapors and krypton which lasing on 431,8nm and 469,4nm blue-green krypton ion lines and 615nm red and 794,5 nm IR mercury ion lines. The studied lasers can be useful at information processing, in a metrology, etc.

Keywords: ion metal vapor laser, hollow cathode discharge, the combined active media

Results of application of laser technology of processing of seeds of a spring-sown field are presented in article. Results of researches confirm positive influence of application of laser technology, selection of the optimum processing conditions of seeds of wheat therefore productivity of the processed wheat of a grade of "Irgin" increases is carried out.

Keywords: intensive technology, use of the laser, mode of behavior, laser processing, efficiency, productivity, quality of products, radiation dose, experiment

Results of the performed works at calibration of the metal-cutting machine are given in article. The technology of performance of control is considered. The conclusion in which it is noted that laser trackers including the measuring Vintag vehicle produced by Faro firm, possess high efficiency of the solution of problems of calibration is made. Their software has an opportunity to carry out processing of results of measurements and preparation of reports directly on the platform of performance of work and to give results on the place. To provide the accuracy of measurements of the spatial coordinates of 0.005-0.01 mm at distances to 10000-15000 mm. All these characteristics allow to recommend to machine-building enterprises use of such and similar measuring cars for the solution of problems of calibration of metal-cutting machines.

Keywords: Laser trekker, measurements, geometrical parameters, straightforwardness, perpendicularity, metrology, calibration, metrological characteristics

The lasers working at mixture of helium and mercury vapors, and at mixture of neon and thallium vapors, in which the population inversion and laser oscillation are carried out on mercury ionic quantum transitions with the wavelengths of 615 nm and 794,5 nm, and on thallium ionic transitions with a wavelength of 594,9 nm and 695 nm are investigated.The conclusion is drawn about a similarity of pumping of ion quantum transitions of metals in the active media of ion gas discharge metal vapor lasers in plasma of transverse-type discharges: the hollow cathode discharge and a capacitive high-frequency discharge. The optimum discharge conditions from the point of view of obtaining the maximum laser output power have been experimentally found when using for pumping as transverse-type discharge with hollow cathode with high repetition rate of current pulses up to 100 kHz. The structure of 594,9 and 695nm thallium ionic laser lines caused by hyperfine and isotopic splitting of laser levels is investigated. The frequency intervals between components of 594,9nm laser line (45 GHz and 102 GHz) and of 695 nm line (35GHz) are measured

Keywords: ion metal vapor laser, high-frequency discharge, hollow-cathode discharge with high repetition rate of current pulses, optimum conditions for laser oscillation