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We present a new method for evaluation the absorption coefficient of the crystal melt around the phase transition zone for the spectral range of semitransparency. The emissivity distribution across the crystallization front of the sapphire crystal fiber was measured at the quasi-stationary laser heated pedestal growth (LHPG) process (Fejer et al., 1984; Feigelson, 1986) and the data for solid state,...
Temperature distribution along a single crystal fiber molten zone in the laser heated pedestal growth (LHPG) process of pure sapphire (Al2O3) and yttrium–aluminum garnet (Y3Al5O12) fiber was measured for the first time. The temperature was determined from thermal radiation spectra measurements in the visible spectral range. Our measurements indicate the existence of local temperature minimum in the...
Single crystal fibres on a basis rare-earth oxides are promising materials for technical application, in particular for radiation delivery in a near and mid-IR range. In the fibres shape Eu3+:Y2O3 [1], Ln3+:Gd2O3 (Ln=Nd, Eu, Er) [2,3] single crystals have been received earlier and their luminescent properties have been studied. The goal of our study consisted in the interrelation analysis between...
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