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Information × Registration Number 0226U000063, (0124U002002) , R & D reports Title Development of ceramic composite active medium YAG:Nd3+/YAG:Sm3+ for special purpose laser systems popup.stage_title Одержання та тестування композитних оптичних елементів YAG:Nd3+/YAG:Sm3+ Head Vorona Ihor О., Кандидат фізико-математичних наук Registration Date 02-01-2026 Organization Institute of Single Crystals of the National Academy of Sciences of Ukraine popup.description1 Creation of ceramic composite active medium YAG:Nd3+/YAG:Sm3+ for the novel high-power near-IR lasers. popup.description2 The present study investigates the influence of the qualitative composition of functional additives on the optimal consolidation temperature of transparent ceramics YAG:Nd³⁺ and YAG:Sm³⁺. It has been established that the microstructural characteristics and optical properties of YAG:Nd³⁺ ceramics modified with a complex additive (Si⁴⁺+Mg²⁺) exhibit substantially reduced sensitivity to variations in consolidation temperature compared to ceramics doped with silicon ions alone. Based on the obtained results, optimal technological processing routes were determined for the fabrication of YAG:Nd³⁺ and YAG:Sm³⁺ optical ceramics using identical temperature–time sintering regimes when employing the complex additive. This approach enables the simultaneous production of different functional layers or elements within a single technological cycle. Issues related to diffusion bonding techniques employing an intermediate layer for the fabrication of combined optical elements based on transparent YAG:Nd³⁺/YAG:Sm³⁺ ceramics were investigated. It was found that diffusion bonding carried out via high-temperature annealing under vacuum conditions may be accompanied by an increase in the volume fraction of residual porosity within the ceramic material. This effect is attributed to the reducing environment of vacuum annealing, which promotes an increase in the equilibrium concentration of vacancies in the garnet crystal lattice, thereby facilitating the growth and stabilization of residual pores. To address these limitations, a modified diffusion bonding approach was proposed, specifically adapted for application to transparent YAG ceramic elements. This method involves annealing in an air atmosphere rather than under vacuum conditions. As a result, optimal temperature–time parameters for diffusion bonding in air were identified, ensuring the formation of monolithic composite optical elements without an increase in residual porosity and with preservation of high optical quality. Product Description popup.authors Oleksii K. KAPUSTNYK Anton E. BALABANOV Ihor O. VORONA Arsenii D. TIMOSHENKO popup.nrat_date 2026-01-02 Close