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Home » News » Blog » How to choose USA Zn se12mm 18mm 19mm 19.05mm 20mm 22mm 25mm 28mm 38 .1mm Co2 laser optical lens(three)

How to choose USA Zn se12mm 18mm 19mm 19.05mm 20mm 22mm 25mm 28mm 38 .1mm Co2 laser optical lens(three)

Views:1     Author:Site Editor     Publish Time: 2019-01-17      Origin:Site

      Reflective USA Zn se12mm 18mm 19mm 19.05mm 20mm 22mm 25mm 28mm 38 .1mm Co2 laser optical lens coating.  Regardless of the substrate material used, in the infrared region, especially at 10.6 μm, all standard reflective USA Zn se12mm 18mm 19mm 19.05mm 20mm 22mm 25mm 28mm 38 .1mm Co2 laser optical lens coatings have some commonality. Before discussing the specific coating of infrared reflective USA Zn se12mm 18mm 19mm 19.05mm 20mm 22mm 25mm 28mm 38 .1mm Co2 laser optical lenses, let's first look at the simplest reflective USA Zn se12mm 18mm 19mm 19.05mm 20mm 22mm 25mm 28mm 38 .1mm Co2 laser optical lens - polished uncoated metal substrate.

      The most common uncoated metal reflective USA Zn se12mm 18mm 19mm 19.05mm 20mm 22mm 25mm 28mm 38 .1mm Co2 laser optical lens is made of copper, followed by molybdenum. The use of uncoated metal as a reflective USA Zn se12mm 18mm 19mm 19.05mm 20mm 22mm 25mm 28mm 38 .1mm Co2 laser optical lens has several advantages: low cost, no need to worry about the performance degradation of the film over time and the inconsistency caused by the supply from different manufacturers. The reflectivity of the uncoated metal is theoretically determined by the wavelength, and the reflectance does not change as long as the substrate is not contaminated during use. The main drawback of using uncoated metal as the reflective USA Zn se12mm 18mm 19mm 19.05mm 20mm 22mm 25mm 28mm 38 .1mm Co2 laser optical lens is that the reflectivity is lower than that of the multilayer dielectric film layer. For example, uncoated copper has a reflectivity of approximately 98.8% at a wavelength of 10.6 μm. The reflectivity of a typical reflective USA Zn se12mm 18mm 19mm 19.05mm 20mm 22mm 25mm 28mm 38 .1mm Co2 laser optical lens dielectric film layer is 99.6% or higher. The lower reflectivity and higher absorption cause the uncoated metal mirror to cause thermal deformation of the USA Zn se12mm 18mm 19mm 19.05mm 20mm 22mm 25mm 28mm 38 .1mm Co2 laser optical lens and laser beam. Since high reflectivity and low thermal deformation are critical in laser systems, uncoated copper and molybdenum are not commonly used in recent years. Another drawback of uncoated copper is its softness: uncoated copper is not effectively cleaned without wiping. Similarly, too long a bare copper chemical reaction will form oxides and other compounds on its surface, thereby reducing performance.

      Other uncoated metals that are widely used as reflective USA Zn se12mm 18mm 19mm 19.05mm 20mm 22mm 25mm 28mm 38 .1mm Co2 laser optical lenses in the infrared region are gold and silver. It is impractical to use solid gold or silver as reflective USA Zn se12mm 18mm 19mm 19.05mm 20mm 22mm 25mm 28mm 38 .1mm Co2 laser optical lenses (not to mention that they are extremely expensive). In contrast, such rare metals are commonly used as vacuum coating or plating films for other substrates. Their inherent reflectivity is higher than copper or molybdenum: at a wavelength of 10.6 μm, typically the reflectance of gold is 99.0% and the reflectivity of silver is 99.2%. However, they have the same weakness, such as they are more flexible than other metals. The chemical activity of silver leads to the formation of surface compounds such as sulfides and chlorides. These compounds can cause a decrease in the performance of the reflective USA Zn se12mm 18mm 19mm 19.05mm 20mm 22mm 25mm 28mm 38 .1mm Co2 laser optical lens, causing the silver film layer to fall off the substrate.


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