Upper Laser Protective Lens for Laser Cutting Head D21.5x2

✅ 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: 21.5mm
Thickness: 2 mm,

Model: D21.5T2-4

D21.5 = 21.5 mm diameter; T2 = 2 mm thickness; -4 = Compatible with fiber lasers up to 15 kW; first piece in the upper drawer of the cutting head (upper protective lens) Model    D21.5T2-4 (upper protective lens)
Baochu Original Material Code    P.S.B0041 Shanghai Baochu Electric...
Dimensions    Φ21.5 mm × Thickness 2 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    ≤15 kW fiber laser Shanghai Bochu Electric...
Dimensional Tolerances    Diameter ±0.01 mm; Thickness ±0.01 mm; Parallelism ≤10″
Installation Location    Upper drawer of the cutting head, first piece (Upper-1)

Compatible with BLT420/BLT420S/BLT421/BLT421T/BLT44F/BLT441/BLT441T/BLT641/BLT641H/BLT640

Model: D21.5T2-6

D21.5 = Diameter 21.5 mm; T2 = Thickness 2 mm; -6 = Compatible with fiber lasers up to 20 kW; first piece in the upper drawer of the cutting head (upper protective lens); Model: D21.5T2-6 (upper protective lens)
Bochu Original Part Number: DP.V.P0001AA
Dimensions    Φ21.5 mm × Thickness 2 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, first piece (Upper-1)

Compatible with BLT460F/BLT461/BLT661/BLT661H