光谱学与光谱分析, 2014, 34 (3): 713, 网络出版: 2014-03-14
氟化钡晶体真空紫外透过率温度特性研究
Study on the Vacuum Ultraviolet Transmittance of Barium Fluoride Crystals at Different Temperature
摘要
真空紫外波段存在几个可用于研究电离层物理现象的重要光谱, 其中1356 nm的夜气辉是重要的探测谱段, 通过对该波段辐射强度的探测可反演出电离层电子密度(TEC)及F2层峰值电子密度。 夜气辉发射线中, 1304 nm的发射线与1356 nm光谱间隔很近, 发射强度与1356 nm强度相当, 因此, 要实现对1356 nm夜气辉探测需要抑制1304 nm气辉辐射。 分别对05和1 mm厚的真空紫外级别的氟化钡晶体窗口透过率随温度变化特性进行研究, 结果表明, 氟化钡晶体的短波截止波长随温度的升高向长波方向偏移, 在一定温度范围内, 氟化钡晶体可以很好地抑制1304 nm辐射, 并在1356 nm波段有较高的透过率。 与国外相关文献所报道的通过加热SrF2晶体来抑制1304 nm辐射的方式相比, 利用氟化钡晶体作为短波截止滤光片, 可以将1304 nm的杂散光完全抑制, 同时可以降低仪器功耗, 对于电离层光学遥感探测有着重要的意义。
Abstract
Two VUV-grade BaF2 windows with 05 mm-thick and 1 mm-thick respectively were selected to study the transmittance variety with the temperature. The results show that the cutoff wavelength of BaF2 crystals will shift towards the long wave with the increase in temperature. In a certain temperature range, BaF2 crystals can depress 130.4nm radiation well, and also has a high transmittance at 1356 nm. Compared with the reported method in which SrF2 crystals can be applied to suppress 1304 nm stray light by heating, BaF2 crystal can inhibit the 1304 nm emission line completely, and thus reduce the power consumption of the device at the same time. This indicates that BaF2 crystals can play an important role in the ionosphere optical remote sensing detection.
彭如意, 付利平, 陶冶. 氟化钡晶体真空紫外透过率温度特性研究[J]. 光谱学与光谱分析, 2014, 34(3): 713. PENG Ru-yi, FU Li-ping, TAO Ye. Study on the Vacuum Ultraviolet Transmittance of Barium Fluoride Crystals at Different Temperature[J]. Spectroscopy and Spectral Analysis, 2014, 34(3): 713.