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氯化钾(KCl)晶体原料来源丰富,价格便宜,从可见到中红外波段范围内都有很高的透过率(T>90%)。因而在红外和激光技术中被广泛地用来制作透镜、平晶、窗口等光学元件。但其防潮问题国内一直没有解决好。为了防止氯化钾晶体表面潮解,我们采用了真空蒸发法在晶体光学表面镀上一层具有宽阔透明区、不溶于水、化学稳定性好的聚全氟乙丙烯(F_(46))或3M 氟树脂保护膜。这两种有机氟保护膜从2.5μ至16μ波段范围内的透过率可达90%以上。我们在真空蒸发制备 F_(46)或3M 有机氟保护膜时作了几种加热方法的对比实验,确定了用钨丝在石英舟外部绕成螺线管间接加热法,此种加热法能实现周围同时加热的效果,膜料易蒸发。
Potassium chloride (KCl) crystals are abundant in raw materials and are inexpensive, with high transmission (T> 90%) from the visible mid-infrared band. Thus in the infrared and laser technology is widely used to produce lenses, flat crystals, windows and other optical components. However, the domestic moisture problems have not been solved. In order to prevent the surface of potassium chloride crystal from deliquescence, we adopted the vacuum evaporation method to coat the crystal optical surface with a layer of FEP (F_ (46)) or 3M Fluororesin protective film. The two organic fluorine protective film from the 2.5μ to 16μ wavelength range of transmittance up to 90%. We made several F4 (46) or 3M organic fluorine protective film vacuum evaporation when the comparison of several heating methods to determine the use of tungsten wire spiral wound around the outside of the quartz tube indirect heating method, this heating method can be achieved Around the same time the effect of heating, membrane material easy to evaporate.