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     High temperature Raman spectroscopy of crystalline, molten and vitreous states of dielectric inorganic materials at ultrahigh temperatures
»ã±¨ÄÚÈݼò½é£ºHigh Temperature Raman Spectroscopy (HTRS) is the informative method for studying “in situ“ phase transformations and a behavior of the structure of oxides materials at a high temperature. These materials are used widely as laser media, optic fibers and as micro- and nano-materials. The synthesis from the melt is the main technique for the production of oxide single crystals. The information on the formation of a molten state and on a behavior of the oxide materials structure in the growth processes is necessary for a modification of synthesis conditions. It is this information that can be received with HTRS technique. It was difficult to use HTRS for investigation of oxide compounds with high melting point due to a high thermal radiation of the furnace and the sample, which interfered with a registration of a week signal of Raman scattering. HTRS technique, developed by us in 1980, permitted to increase the temperature of experiments up to 2200K and to study the materials in crystalline, molten and vitreous states in a polarized light. In contrast to the conventional Raman spectroscopy technique we used a copper vapor laser as an excitation source, operated in a pulse repetition regime with a frequency of 15 kHz and the pulse power duration of 10- nsec. An average power was 10 W and a peak pulse power was about 30-50 kW. High laser peak pulse power resulted in a large contrast between the Raman scattering signal and the thermal radiation background. There was signal gating circuit with the duration time of 11 nsec. A thermal irradiation background was suppressed in 104 times.
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