OPTICAL MEDIUM BASED ON CRYSTAL OF HALIDE RUBIDIUM-YTTRIUM RBY2CL7, CONTAINING MONOVALENT BISMUTH I

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FIELD : physics. SUBSTANCE : optical medium is proposed based on the halide crystal containing low-valency bismuth ions as the only optically active center, capable of broadband luminescence in the near IR-range, which is a crystal phase of rubidium chloride-yttrium RbY2Cl7containing isomorphic admixture of monovalent bismuth ions Bi+ in the amount of 0.1 to1 at. %. The optical medium fluoresces in the range of 800-1100 nm, when excited by radiation with the wavelengths in the range of 570-780 nm. The process for producing the optical medium includes preparing a batch by mixing RbCl, YCl3 and BiCl3 in the molar ratio of 1 : 2 : 0.003-0.03, adding metal bismuth to the batch at the molarratio of BiMe/BiCl3=1, placing the mixture in the quartz container in a vacuum into the vertical oven of Bridgman-Stockbarger, where the temperature in the hot zone is 620-630°C, in the cold zone - 480-500°C, and the movement speed of the container from the hot zone to the cold one is 0.2-2 mm/h to form a single-crystal sample of the optical medium. The obtained optical medium has a stable luminescence in the near IR-range, which allows its use as the active medium for the broadband amplifiers and lasers. EFFECT : method for producing a chloride crystal is fairly simple and technological and allows to grow high-quality crystals of the required size. 3 cl, 3 dwg, 3 ex