Restraint deformation and corrosion protection of gold deposited aluminum mirrors for cold optics of mid-infrared instruments
Restraint deformation and corrosion protection of gold deposited aluminum mirrors for cold optics of mid-infrared instruments
复制标题
中红外仪器冷光学镀金铝反射镜的变形抑制与腐蚀防护
DOI：
10.1117/12.2054917
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
K. Mitsui
中科院分区：
文献类型：
--
作者：
M. Uchiyama;T. Miyata;S. Sako;T. Kamizuka;T. Nakamura;K. Asano;K. Okada;T. Onaka;I. Sakon;H. Kataza;Y. Sarugaku;O. Kirino;H. Nakagawa;N. Okada;K. Mitsui
本文报道了中红外仪器用镀金铝镜的约束变形和防腐蚀。为了评估铝反射镜的热收缩变形，在从室温到100 K的冷却循环中对反射镜的表面进行了监测测量。结果表明，在反射镜上加装弹簧垫圈后，变形的影响减小到原来的四分之一。我们已经探索出一种有效的方法来防止镜子被电腐蚀。通过改变涂覆条件，如插入绝缘层、制作多层和外涂阻水层或在涂覆前进行精密清洗，制备了许多样品。沉积前的精密清洗和在金层上用SiO保护涂层似乎有效地阻止了铝的腐蚀。SiO外涂层反射镜经受住了中红外使用的冷却测试，与没有涂层的镀金反射镜相比，在6-25微米处检测到反射率降低约1%。
We report the restraint deformation and the corrosion protection of gold deposited aluminum mirrors for mid-infrared instruments. To evaluate the deformation of the aluminum mirrors by thermal shrinkage, monitoring measurement of the surface of a mirror has been carried out in the cooling cycles from the room temperature to 100 K. The result showed that the effect of the deformation was reduced to one fourth if the mirror was screwed with spring washers. We have explored an effective way to prevent the mirror from being galvanically corroded. A number of samples have been prepared by changing the coating conditions, such as inserting an insulation layer, making a multi-layer and overcoating water blocking layer, or carrying out precision cleaning before coating. Precision cleaning before the deposition and protecting coat with SiO over the gold layer seemed to be effective in blocking corrosion of the aluminum. The SiO over-coated mirror has survived the cooling test for the mid-infrared use and approximately 1 percent decrease in the reflectance has been detected at 6-25 microns compared to gold deposited mirror without coating.