protective window d27.9mm et4.1mm (1090 nm) for fiber laser max.20kw - germany material

d27.9 et4.1 protective window for high-power high-duty fiber laser cutting heads.high-duty germany material protective window made from fused silica with ar coating around 1090 nm and rated for up to 20 kw when used in a properly maintained head. this optic sits in front of the focus lens and takes the hit from spatter, fumes and dust so your main optics stay clean longer.

size:

• diameter (d): 27.9 mm

• thickness (et): 4.1 mm

• quantity: 1 × protective window

spec:

• optimized for ~1090 nm fiber laser systems

• ar-coated surfaces to reduce reflection and power loss

• power handling: up to 20 kw in a correctly aligned and maintained cutting head

• precise thickness and surface flatness for stable cutting performance

• parallel faces to help maintain consistent focus and gas flow

material:

• quartz fused silica – “germany material” optics

• low absorption and good thermal stability under high power

• durable ar coating for long service life

use:

• protective front window in fiber laser cutting heads

• shields the focus lens from dust, fumes and metal spatter

• helps extend focus-lens lifetime and reduce unplanned downtime and cleaning stops

compatibility:

• for fiber laser cutting heads that use round protective windows at d27.9 mm / et4.1 mm

• commonly used on many raytools / wsx / bodor type heads and similar designs

• always confirm your original window’s diameter and thickness before ordering

quality:

• each window visually inspected and packed in clean trays

• smooth edges and uniform coating for repeatable, reliable performance in production environments