Vol 17, No 6 (2023)

The anniversary 20th International Conference on Holography and Applied Optical Technologies HOLOEXPO 2023 was held in Sochi on September 12–15, 2023 at the City Park Hotel conference center.

The paper considers the results of metallographic and tribotechnical tests of the zones of laser surfacing of the sublayer with a powder containing Fe-Co-Cr-Mo and a composite charge Ni-Cr-B-Si+WC on steel samples 40Kh. It is shown that processing using transverse beam vibrations normal to the scanning velocity vector increases the productivity of the surfacing process. The application of a sublayer not prone to cracking improves the quality of deposited coatings with the addition of a carbide phase, eliminates the formation of cracks in the deposited charge with carbides. An increase in the energy density above the optimal values leads to partial dissolution of carbides, evaporation of carbon, a decrease in the thickness of the sublayer and mixing with the charge with the carbide phase and a decrease in the microhardness of coatings. Laser surfacing at optimal conditions allowed to increase the abrasive wear resistance when tested with loose grains by 11 times compared to the base steel.

A small-scale installation with automated control based on a compact repetitively pulsed CO₂ laser has been developed. It is used to isolate the ¹⁴C carbon isotope during development of the reactor graphite purification process. The operating principle of the facility is based on the selective multiphoton laser dissociation method. The precise wavelength tuning is ensured by the design of a special diffraction grating assembly with automatic control. It is shown that the setup functions are much broader, and it can be used to separate the average-mass isotopes and other chemical elements.

The creation of materials, such as black coatings, operating in the near and middle IR ranges, is a task of current scientific interest. Layers of such materials can be used to improve the efficiency of IR emitters. One of the perspective materials that is well consistent with MEMS technology is a black alumina coating. This article presents the fabrication results of a black aluminum oxide layer by vacuum-thermal evaporation method, and the study of its absorption features in the IR region of the spectrum. Experimental samples of black alumina layers showed absorption in the range of 2,2 to 28 um at 84% and showed high temperature stability up to 800 °C.

A methodological approach is proposed to improve the efficiency of assessing the capabilities of infrared reconnaissance tools, based on the use of graphoanalytic and automated algorithms, as well as the use of the values of the radiated area and maximum dimensions of objects averaged in the range of infrared reconnaissance of the values of the radiation coefficients of objects and typical backgrounds, object and background temperatures, atmospheric transmittance values, averaged over the range of operating wavelengths and implemented using graphs of the dependence of the probability of detection on the range at various fixed values of the coefficient of exploration conditions calculated in advance for the typed parameters of infrared reconnaissance facilities of various bases with acceptable accuracy. Recommendations have been developed to counteract the means of infrared reconnaissance in conditions of unsatisfactory intelligence availability.