Hass G, Hunter W R
Appl Opt. 1978 Aug 1;17(15):2310-5. doi: 10.1364/AO.17.002310.
The transmittance of cultured crystalline quartz has been measured in the vacuum uv from 2000 A to its cutoff wavelength. For most samples this cutoff wavelength is approximately 1450 A, but some samples had very low transmittances to wavelengths as long as 1600 A. Furthermore, in the spectral region from 1450 A to 2000 A, all the samples had nonuniform transmittances as a function of position on the sample. Most of these nonuniformities are quite pronounced close to the cutoff wavelength but disappear or are very small at 2000 A. After irradiation with 1-MeV electrons, the transmittances of the good, fairly uniform, samples were practically unchanged. However, areas of some of the less uniform samples became quite black to the eye and practically nontransmitting in the vacuum uv. In most cases, blackened and nonblackened areas, on the same sample, had quite sharp boundaries, on the order of 1 mm or less. The blackened areas had excess aluminum and alkali impurities as determined by paramagnetic electron resonance measurements. A short comparison is made between cultured crystalline quartz and various types of fused silica.
已测量了人工养殖水晶石英在2000埃至其截止波长范围内的真空紫外光透过率。对于大多数样品，该截止波长约为1450埃，但有些样品对长达1600埃的波长具有非常低的透过率。此外，在1450埃至2000埃的光谱区域内，所有样品的透过率随样品上位置的不同而不均匀。这些不均匀性大多在接近截止波长处非常明显，但在2000埃处消失或非常小。用1兆电子伏电子辐照后，良好、相当均匀的样品的透过率实际上没有变化。然而，一些不太均匀的样品区域肉眼看起来变得相当黑，并且在真空紫外光下几乎不透过。在大多数情况下，同一样品上变黑和未变黑的区域具有相当清晰的边界，约为1毫米或更小。通过顺磁共振测量确定，变黑区域含有过量的铝和碱杂质。对人工养殖水晶石英和各种类型的熔融石英进行了简短比较。
