Abstract 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, melt and phase transition zone (melt-solid interface) were obtained. The sapphire melt absorption coefficient was estimated to be 14 ± 2 cm −1 in the spectral range 1–1.4 μm around the melt point. It is consistent with data, obtained by different other methods. This method can be applied to determine the absorption coefficient for other materials.

中文翻译：

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蓝宝石单晶光纤生长过程中的温度和发射率测量

摘要 我们提出了一种评估半透明光谱范围内相变区周围晶体熔体吸收系数的新方法。在准稳态激光加热基座生长 (LHPG) 工艺（Fejer 等人，1984 年；Feigelson，1986 年）以及固态、熔体和相变数据中测量了蓝宝石晶体光纤结晶前沿的发射率分布区（熔体-固体界面）。在熔点附近 1-1.4 μm 的光谱范围内，蓝宝石熔体吸收系数估计为 14 ± 2 cm -1。它与通过其他不同方法获得的数据一致。该方法可用于确定其他材料的吸收系数。