D27 ET2 Protective Window 20 kW for Fiber Laser Cutting Heads (10 pcs)

fused silica protective window, 27 mm in diameter and 2 mm thick rated up to 20 kw. it is the sacrificial optic of the cutting head: replace it when contaminated and the focus lens stays protected.

size:

• diameter (d): 27 mm
• thickness (et): 2 mm
• pack: 10 × protective window

spec:

• ar-coated for fiber laser wavelengths to reduce reflection and power loss
• rated for 20 kw fiber laser sources (follow your head manufacturer's limits)
• thin 2 mm profile for heads designed around thin windows
• tight flatness and parallelism so the focus does not drift

material:

• high-purity fused silica substrate
• good thermal stability under continuous high-power cutting
• hard ar coating for long service life

use:

• protective window in fiber laser cutting heads
• shields the focus lens from dust, fumes and metal spatter
• quick, low-cost replacement when the window gets contaminated

compatibility:

• for fiber laser cutting heads that use round d27 mm × et2 mm protective windows
• check the diameter, thickness and power rating of your current window first

quality:

• uniform coating from batch to batch
• inspected under light for inclusions and scratches
• protective packaging for safe transport