Upper Laser Protective Lens for Laser Cutting Head D25.4x4

✅ 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
✅ 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
✅ Strong coating adhesion resists metal spatter and allows for light cleaning, reducing burn marks on the lenses and lowering the cost of frequent replacements
✅ Precision optical polishing with strict dimensional tolerances ensures stable coaxiality of the optical path, blocks molten slag, and protects internal focusing and collimating lenses
✅ 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

Diameter: 25.4mm
Thickness: 4 mm,

Model: D25.4T4-4

D25.4 = 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    >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)

Compatible with BLT442/442T/442P/520H/540H/642H/643H

Model: D25.4T4-6

D25.4 = 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)
Bochu Original Material Code     DP.V.P0014AABOCHU Onli...
Dimensions    Φ25.4 mm × Thickness 4 mm
Base Material    High-purity fused silica
Applicable Wavelength    1030–1080 nm (1064 nm for fiber lasers)
Coating    Double-sided high-damage-threshold AR anti-reflective coating, resistant to spatter contamination
Transmittance    >99.9% @1064 nm
Maximum Power Handling    ≤20 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)

Compatible with BLT462/BLT462T/BLT560H/BLT662H/BLT663H/BLT462P

Model: D25.4T4-8

D25.4 = 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, >99.9% @ 1064 nm

Compatible with BLT482/482P/682H/682MA/683H/980MA