D36 ET5 Protective Window 1090nm 15–20 kW for Fiber Laser Cutting Heads (10 pcs)

replacement protective window in d36 / et5 rated for 15–20 kw, made for fiber laser cutting heads. the 1090 nm ar coating keeps transmission high while the window absorbs contamination instead of the focus lens.

size:

• diameter (d): 36 mm
• thickness (et): 5 mm
• pack: 10 × protective window

spec:

• ar coating optimised for 1090 nm fiber laser systems
• suitable for 15–20 kw cutting systems
• 5 mm thickness gives good stiffness and flatness under assist-gas pressure
• plane-parallel faces help keep focus and gas flow consistent

material:

• quartz fused silica window
• stable under rapid local heating from spatter hits
• ar coating applied to both surfaces for high transmission

use:

• protective window in fiber laser cutting heads
• shields the focus lens from dust, fumes and metal spatter
• lets you swap a cheap window instead of cleaning or replacing the lens

compatibility:

• for fiber laser cutting heads that use round d36 mm × et5 mm protective windows
• match diameter, thickness and power class with the window you are replacing

quality:

• each window visually inspected for coating defects and scratches
• clean, chip-free edges
• packed individually to keep the optical faces clean