{"product_id":"upper-laser-protective-lens-for-laser-cutting-head-d25-4x4","title":"Upper Laser Protective Lens for Laser Cutting Head D25.4x4","description":"\u003cp\u003e✅ JGS1 high-purity fused quartz substrate with excellent thermal stability; withstands thermal shock during prolonged continuous cutting at 15 kW and is resistant to cracking\u003cbr\u003e✅ Double-sided hard AR anti-reflective coating with high transmittance at 1064 nm; minimizes laser energy loss to ensure cutting speed and cut-face quality\u003cbr\u003e✅ Strong coating adhesion resists metal spatter and allows for light cleaning, reducing burn marks on the lenses and lowering the cost of frequent replacements\u003cbr\u003e✅ Precision optical polishing with strict dimensional tolerances ensures stable coaxiality of the optical path, blocks molten slag, and protects internal focusing and collimating lenses\u003cbr\u003e✅ Suitable for sheet metal processing of carbon steel, stainless steel, and aluminum—including thin, medium, and thick sheets—and is a cost-effective consumable commonly stocked in factories\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDiameter: 25.4mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eThickness: 4 mm,\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eModel: D25.4T4-4\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eD25.4 = 25.4 mm diameter; T4 = 4 mm thickness; -4 = Compatible with fiber lasers up to 15 kW; second protective window in the upper drawer, model D25.4T4-4 (second protective window from the top), dimensions    Φ25.4 mm × 4 mm thickness, substrate    High-purity fused silica, applicable wavelength    1030–1080 nm (fiber laser 1064 nm), coating    double-sided high-damage-threshold AR anti-reflective coating, resistant to spatter contamination, transmittance    \u0026gt;99.9% @1064 nm, Maximum Power Handling    ≤15 kW fiber laser, Dimensional Tolerances    Diameter ±0.01 mm; Thickness ±0.01 mm; Parallelism ≤10″, Installation Location    Upper drawer of the cutting head, second piece (Upper-2)\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCompatible with \u003c\/span\u003eBLT442\/442T\/442P\/520H\/540H\/642H\/643H\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eModel: D25.4T4-6\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eD25.4 = 25.4 mm diameter; T4 = 4 mm thickness; -6 = Compatible with fiber lasers up to 20 kW; the second window in the upper drawer of the cutting head, model    D25.4T4-6 (second protective lens from the top)\u003cbr\u003eBochu Original Material Code     DP.V.P0014AABOCHU Onli...\u003cbr\u003eDimensions    Φ25.4 mm × Thickness 4 mm\u003cbr\u003eBase Material    High-purity fused silica\u003cbr\u003eApplicable Wavelength    1030–1080 nm (1064 nm for fiber lasers)\u003cbr\u003eCoating    Double-sided high-damage-threshold AR anti-reflective coating, resistant to spatter contamination\u003cbr\u003eTransmittance    \u0026gt;99.9% @1064 nm\u003cbr\u003eMaximum Power Handling    ≤20 kW fiber laser\u003cbr\u003eDimensional Tolerances    Diameter ±0.01 mm; Thickness ±0.01 mm; Parallelism ≤10″\u003cbr\u003eInstallation Location    Upper drawer of the cutting head, second piece (Upper-2)\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCompatible with BLT462\/BLT462T\/BLT560H\/BLT662H\/BLT663H\/BLT462P\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eModel: D25.4T4-8\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eD25.4 = 25.4 mm diameter; T4 = 4 mm thickness; -8 indicates compatibility with fiber lasers up to 30 kW. High-purity fused silica (Fused Silica) high-temperature-resistant quartz crystal, suitable for wavelengths of 1030–1080 nm (1064 nm fiber laser), double-sided coating, \u0026gt;99.9% @ 1064 nm\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCompatible with BLT482\/482P\/682H\/682MA\/683H\/980MA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Fabpartsdepot","offers":[{"title":"D25.4T4-4","offer_id":67666074304787,"sku":"1010702.00107","price":0.0,"currency_code":"AUD","in_stock":false},{"title":"D25.4T4-6","offer_id":67666074337555,"sku":"1010702.00276","price":0.0,"currency_code":"AUD","in_stock":false},{"title":"D25.4T4-8","offer_id":67666074370323,"sku":"1010702.00209","price":0.0,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0994\/5835\/1379\/files\/1_97cb71ae-8a03-492f-9b5d-10a8e0491796.png?v=1793006191","url":"https:\/\/au.fabpartsdepot.com\/products\/upper-laser-protective-lens-for-laser-cutting-head-d25-4x4","provider":"Fabpartsdepot","version":"1.0","type":"link"}