Mssoomm 18mm CO2 Laser Cutter Focus ZnSe Focal Lens D 18mm/0.71" Focal Length FL 38.1mm /1.5" for K40 40w 50w 60w 80w 100w watt CO2 Laser Cutter Engraver Cutting Engraving Machine

How to Determine Focal Length? The Focal Length is the Distance Between the Focal Lens and the cutter/engraver Material. When install the Lens, Make Sure the Focal Lens: Convex Face to Laser, Concave Face to Material. How to Clean Laser Lens and Mirrors? Step 1 Cleaning for Light Contamination (dust, lint particles) Use an air bulb to blow off any loose contaminants from the optic surface before proceeding to the cleaning steps. Step 2 Cleaning for Light Contamination (smudges, fingerprints) Lay the lens tissue on the optic's surface. Using an eyedropper, squeeze a few drops of acetone onto the lens tissue, wetting the complete optic's diameter. Without lifting the lens tissue, drag the lens tissue across the optic just fast enough so that the liquid evaporates behind the tissue. This should leave no streaks. Step 3 Cleaning for Moderate Contamination (spittle, oils) Dampen an unused cotton swab or cotton ball with white distilled vinegar. Using light pressure, wipe the optic's surface with the damp cotton. Wipe excess distilled vinegar with a clean dry cotton swab. Immediately dampen a cotton swab or cotton ball with acetone. Gently wipe the optic's surface to remove any acetic acid. The difference between USA CVD and China PVD: The CO2 laser focal lens are made by USA CVD ZnSe. USA CVD can withstand higher power, and USA CVD has better focusing spot and better laser transmittance than China PVD.

• Diam: 18mm/ 0.71”, Focal length: 38.1mm /1.5", Thickness: approximate 2mm / 0.08 ”, Applicable laser power: 30-250W
• High Quality CVD ZnSe Material from USA. Excellent Optical Properties, for better quality when engraver and cutter, especially suitable for k40 laser engraver cutter machine.
• Superb Coating Process: Double-sided Solid Coating. Wiping Resistance. Long Working Life.
• High Precision Process: Excellent Substrate. Precision Slicing, Polishing, Grinding Processes. Adapt to higher operating temperatures.
• High Transmittance: High Quality Material and Exquisite Coating. Reduce the Loss of Laser. Higher Work Efficiency.