![]() We can choose the appropriate focusing lens according to the different applications: Material Physical Vapor Deposition (PVD) and Chemical Vapor Deposition ( CVD ) are two processes used to produce a very thin layer of material, known as a thin film, onto a substrate.If you want to know more details of znse materials,kindly click here. Zinc selenide lenses can be divided into PVD and CVD according to different growth methods of raw materials. Ge used to be the lowest cost CO2 lens material because its widespread use in the semiconductor industry created a large supply. As temperature increases, its absorption increases, which leads to thermal failure in high power applications. Germanium (Ge) can only be used in low power applications because it is subject to thermal runaway. It also has a high thermal conductivity which helps transmit heat away from embedded particles. It has a relatively high hardness which helps repel debris particles. Gallium Arsenide (GaAs) is the material of choice in dirty or high- splatter environments. It is also the only material that transmits visible light, a requirement for the use of a HeNe alignment laser. therefore, the material of choice for high-power applications. ![]() Zinc Selenide (ZnSe) has the lowest absorption of the common CO2 transmitting materials. ![]() For the focus lens, the problem is not always visible, but you can test a drill hole in acrylic to see if the single beam hole looks good.6.3 Precautions for the use of laser engraving machine lenses? Raw materialsĪccording to the material Co2 laser focusing lens can be divided into zinc selenide, gallium arsenide, and germanium lens. For mirrors, you can see the degraded quality and know to change them. If there is dirt is pits that cannot be cleaned off with the swab, then, again, replace the optics. If you see the reflective coating worn off, then it is time to get a new mirror or focus lens. As an optics supplier, we see photos of some very bad looking mirrors and focus lenses, with questions as to whether they are still good. Perform inspections regularly on your laser machine, so that you can understand how often the optics need cleaning. The mirrors further from the focus assembly require less frequent cleaning. It can be accessed with a cotton swab if it does need cleaning. The example photo below shows an Epilog laser mirror, and your machine will have one in approximately the same location. In addition to the focus lens and the mirror directly above it, there is a mirror located on the left side of the machine and is mounted to the X-beam. If necessary, swab again to remove any and all streaks from the mirrors. Allow the optics to dry before then inspect for streak marks. While using the swabs, clean in various directions, such as diagonal in one a direction, then with another swab, diagonal lines in yet a different direction. Use many cotton swabs and discard the used ones. ![]() Wet the swab thoroughly with the solvent, and then blot it against a piece of cotton so that it is no longer soaking wet or shake it. Then daub the optic gently so as not to abrade the coating off the mirror or lens, then rotate the swab after each daub to expose clean cotton to the surface, until the optic is free of visible contamination. To clean the optics use a high-quality cotton swab moistened with the optics cleaning liquid. Please read the label on the bottle carefully. Acetone can be used, but should not be used for regular cleaning as it contains impurities, which can contaminate the optics. Rubbing alcohol should be used only to remove fingerprints. You may also use distilled white vinegar (ten parts water, one part white vinegar) or pure grain alcohol (such as Everclear). You can buy a higher grade 95%+ medical alcohol sold at the pharmacy. Some suppliers sell them, such as Epilog-supplied lens cleaner. Here we’ll walk you through the steps of cleaning this crucial component of your laser system. The lens and mirror are in a single assembly and can be removed from the machine for cleaning, but it is generally not recommended. The two optical components most likely to require cleaning are the focus lens and the mirror directly above it. So it’s very important to keep them clean. This can also greatly reduce the engraving and cutting quality due to inconsistent output power or power fluctuations of your machine during operation. Also, if smoke, dirt, or other contaminants are not removed for your laser optics on time, they will reduce the laser power and may cause problems. By checking and cleaning regularly you can save a lot of money because your mirrors and lenses will last longer. It’s highly important to make sure your optics are fully clean to keep your laser system operating at its best.
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