A common laboratory source of light is provided by a mercury arc . 通常的实验室光源选用汞弧灯。
Quartz mercury arc lamp 石英汞弧灯
A beam of light ( typically ultraviolet light from a mercury arc lamp ) shines through the chromium mask , then passes through a lens that focuses the image onto a photosensitive coating of organic polymer ( called the photoresist ) on the surface of a silicon wafer 一束光(通常是汞弧灯发出的紫外光)先穿透铬光罩,然后通过透镜把影像聚焦在晶圆表面的有机高分子感光涂料(称为光阻剂) 。