INCREASING THE EFFICIENCY OF LASER MEDICAL DEVICES WITH FIBER-OPTIC LIGHT GUIDES UNDER THE CONDITIONS OF EXTERNAL THERMAL EFFECTS

Abstract

Study of the influence of the controlled parameters of the electron beam (the density of the thermal effect Fn and the speed of movement (scanning) along the treated surface V) on such important parameters of the quality of the end surfaces of the light guides as their cleanliness and micro-roughness, which have a significant impact on the transmission coefficient of IR radiation kl, are now limited. Therefore, the purpose of this work is to establish the regularities of the influence of the controlled parameters of the electron beam, to determine the optimal ranges of their application, which do not lead to the destruction of the treated end surfaces of light guides made of optical glass and maximize the IR transmission coefficient by increasing their purity and reducing micro-roughness, which makes it possible to increase the efficiency of devices in conditions of external thermal effects.The study of the thermal effect of an electron beam on optical glass elements was carried out on specialized electron beam equipment protected by Ukrainian patents. Modern methods of physical and chemical analysis were used to conduct experimental research. The obtained experimental data were processed in dialogue mode and in real time on a PC using modern methods of mathematical statistics and standard application programs. At the same time, the relative measurement error of the considered parameters does not exceed 5...7 %.Experimental studies were carried out and optimal ranges of electron beam parameter changes were established (thermal action density Fn = 3∙106...7∙108 W/m2; scanning speed V = 6∙10-3...4∙10-2 m/s), within in which the most significant improvement in the quality parameters of the processed end surfaces of light guides is observed (increasing the cleanliness of the surfaces and reducing their micro-roughness), which leads to an increase in the spectraltransmittance of IR radiation. As a result, the maximum allowable range of propagation of laser radiation in light guides increases and provides better diagnostics, therapeutic and surgical treatment, which contributes to increasing the efficiency of laser medical devices, especially when they are operated taking into account external thermal effects.