The transmission range of Zinc Selenide ZnSe-CVD is 0.5 - 20 µm.
Special care should be taken when handling Zinc Selenide as it is a toxic material. Always wear rubber or plastic gloves to avoid risk of contamination.
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A: Metal laser cutting machine - metal cutting 1) Structural steel The material will get better results when cut with oxygen. When oxygen is used as a process gas, the cutting edge is slightly oxidized. For plates up to 4 mm in thickness, high pressure cutting can be performed with nitrogen as the process gas. In this case, the cutting edge will not be oxidized. For plates with a thickness of more than 10 mm, special electrodes are used for the laser and the surface of the workpiece can be oiled during processing to obtain better results.
2) Stainless steel cut stainless steel needs: Use oxygen, it does not matter if the edge is oxidized; Use nitrogen to get oxidized without burr-free edges, no need to deal with it. The coating film on the surface of the plate will get better perforation without reducing the processing quality.
3) Aluminum materials Despite their high reflectivity and thermal conductivity, aluminum materials with a thickness of up to 6 mm can be cut, depending on the type of alloy and laser capability. When cut with oxygen, the cutting surface is rough and hard. With nitrogen, the cutting surface is smooth. Pure aluminum is very difficult to cut because of its high purity. The aluminum can only be cut when a "reflection absorbing" device is installed on the system. Otherwise the reflection will destroy the optical components.
4) Titanium metal titanium plates are cut with argon and nitrogen as process gases. Other parameters can refer to nickel-chromium steel.
5) Both copper and brass materials have high reflectivity and very good thermal conductivity. Brass with a thickness of 1 mm or less can be cut with nitrogen; copper with a thickness of 2 mm or less can be cut, and the processing gas must be oxygen. Copper and brass can only be cut when a "reflection absorbing" device is installed on the system. Otherwise the reflection will destroy the optical components.
Second: When cutting synthetic materials synthetic materials, we must keep in mind the danger of cutting and possible discharge of dangerous substances. Processable synthetic materials are: thermoplastics, thermosetting materials and elastomers.
Three: Organic matter is in danger of catching fire in the cutting of all organic materials (using nitrogen as the process gas, but compressed air can also be used as the process gas). Wood, leather, cardboard, and paper can be cut with a laser and the cutting edges burnt (brown)
ZnSe CVD used for high power CO2 laser optics at 10.6µm, for protective optics windows or optical elements in FLIR (forward looking infrared) thermal imaging equipment, optics for medical and industrial applications (optical plane parallel windows (plates, disks, blanks), wedged windows, optical meniscus, spherical and cylindrical lenses, prisms, resonator mirrors of CO2 laser).
The refractive index is near 2.4. Zinc Selenide has a very low absorbtion coefficient and is used extensively for high power infrared laser optic. It is non-hygroscopic.
Zinc Selenide (ZnSe) - transparent in wide spectral range from yellow (visible) to far IR. ZnSe material is a chemically inert, non-hygroscopic and highly pure product that is very effective in many optical applications due to its extremely low bulk losses, high resistance to thermal shock and stability in virtually all environments, easily machined.
With the increasing application of laser cutting, there are more and more suitable materials. However, different materials have different characteristics. Therefore, when laser cutting is used, the matters needing attention are also different. The following is a brief analysis of the main materials used for laser cutting: