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Information × Registration Number 0225U001706, (0122U001500) , R & D reports Title Development of technology of surface-activated diffusion bonding for fabrication of optical elements of complex architecture from ceramics and crystals of high-melting compounds popup.stage_title Розвиток технології поверхнево-активованого дифузійного зварювання для створення оптичних елементів складної архітектури з кераміки і кристалів тугоплавких сполук Head Tolmachov Oleksandr V., Доктор фізико-математичних наукYavetskiy Roman P., Доктор технічних наук Registration Date 05-02-2025 Organization Institute of Single Crystals of the National Academy of Sciences of Ukraine popup.description1 Adaptation of technology of diffusion bonding for fabrication of highly-effective laser sources with complex architecture for security and defense popup.description2 The goal of the project is to adapt diffusion bonding technology for producing high-efficiency laser media with complex architectures to meet security and defense needs. The conditions for obtaining single-phase, highly-doped YAG:Sm3+ ceramics with a samarium ion content of ≤9 at.% were implemented. At higher concentrations, partial decomposition of the supersaturated substitutional solid solution occurs, forming a samarium-enriched impurity phase at the ceramic grain boundaries. This increases optical losses due to light scattering at the interfaces between the matrix and secondary phases, which have different refractive indices. A method for bonding of YAG:Sm3+ and YAG:Nd3+ single crystals and ceramics via diffusion bonding without applying external pressure was developed. It was demonstrated that modifying the bonding surfaces with silicon-containing compounds leads to the formation of a liquid phase at temperatures above 1400°C (SiO2–YAG eutectic), ensuring crystal monolithization and eliminating the physical boundary at the interface. Experimental samples of combined active elements (Sm3+:YAG/Nd3+:YAG/Sm3+:YAG) were fabricated. It was shown that optical losses at the interface of the combined element are virtually absent, two- and three-layer samples exhibit optical properties comparable to those of the starting single crystals.   Product Description popup.authors BALABANOV Anton E. VORONA Ihor O. DOBROTVORSKA Mariia V. DOROSHENKO Andrii H. KRYZhANOVSЬKA Oleksandra S. LYTVYNOV Leonid A. MATVIYeNKO Oksana O. MATEYChENKO Pavlo V. PARKHOMENKO Serhii V. SAFRONOVA Nadiia A. TIMOSHENKO Arsenii D. TOLMAChOV Oleksandr V. CHERNOMORETS Dariia H. YaVETsЬKYY Roman P. popup.nrat_date 2025-02-05 Close