Prospects for using microwave radiation to sinter optically transparent ceramics are stipulated by the absence of the heaters and screens contaminating the sintered material and the presence of the inverse temperature distribution in the product, which allows one to fabricate maximum-density ceramics. In this work, we present the results of studying the process of producing optically transparent Yb:YAG and Yb:(LaY)2O3 ceramics when the samples are sintered in the chamber of a gyrotron complex operated at a frequency of 24 GHz. The various-composition samples were manufactured by compaction of a mixture of commercially available powders (Yb:YAG ceramics) and the powders prepared by the self-propagating high-temperature synthesis (Yb:(LaY)2O3 ceramics). The sintering temperatures were varied in the interval 1700–1900°C, the sintering time was varied from 2 to 20 h, and the residual-air pressure in the working chamber was 10 Pa. Lasing was obtained for the samples of both compositions.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 56, Nos. 8–9, pp. 637–646, August–September 2013.
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Egorov, S.V., Bykov, Y.V., Eremeev, A.G. et al. Laser Ceramics Sintering by Millimeter-Wave Heating. Radiophys Quantum El 56, 574–581 (2014). https://doi.org/10.1007/s11141-014-9461-5
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DOI: https://doi.org/10.1007/s11141-014-9461-5