Fibre Laser Protective Windows Replacement fused silica protective windows (cover slides) for fibre laser cutting heads. The protective window sits below the focus lens and shields your optics from spatter, smoke and debris — a cheap consumable that protects an expensive lens. Available in sizes from 18×2mm to 37×7mm to suit machines up to 20kW. Specifications Material: high-purity fused silica Optical transmission: over 99.95% at 1005–1080nm Anti-reflective coated for 1064nm fibre laser wavelength Surface flatness λ/10, low thermal expansion for focus stability Sizes (diameter × thickness): 18×2, 21.5×2, 24.9×1.5, 25.4×4, 27.9×4.1, 30×5, 32×2, 34×5, 36×5, 37×7mm Power ratings from under 4kW up to 20kW Compatible cutting headsFits Raytools, Precitec, WSX, Ospri and Boci fibre laser cutting heads. Protective windows are sized to your specific head and laser power, so if you're not sure which you need, tell us your machine, head model and laser power and we'll match the right window. Choosing a protective windowThe correct size depends on your cutting head model and laser power — higher-power machines use thicker windows to handle the heat load. Always match both the dimensions and the power rating to your machine. Replace the window as soon as you see pitting, burn marks or reduced cut quality; a damaged window lets debris reach the focus lens. ShippingDispatched from Brisbane, Australia-wide. In stock and ready to ship. Why buy from DK Machine TechWe repair fibre laser sources and rebuild cutting heads for Australian manufacturers — so the parts we supply are the same ones we fit and trust in the workshop. Technical questions welcome; you're talking to people who service these machines, not just sell parts. Regular user? Our 10-packs save you around 17% per unit and mean you're never caught without a spare mid-job.
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