Fiber Laser Lens Specification Chart
Find the right focal length, diameter, and coating spec for your machine power level and cutting application.
Focusing lens
Converts the collimated beam into a focused spot at the cutting surface. Focal length determines spot size and depth of focus — shorter FL gives smaller spot (finer kerf), longer FL gives deeper penetration for thick plate.
Collimating lens
The first optical element — collimates (parallelises) the diverging beam from the fiber output. Matched to the fiber NA and head design. Generally only changed when the entire head or fiber is being replaced.
Protective window
Sits between the nozzle and the focusing lens. Its sole job is to protect the expensive focusing lens from spatter and debris. Protective windows are sacrificial — replace them on a schedule.
| Machine Power | Focus FL (standard) | Focus FL (thick plate) | Collim. FL | Material Range | Common Brands |
|---|---|---|---|---|---|
| 1 kW | f=125mm | f=150mm | f=100mm | 0.5–4mm | Entry-level Han's, Bodor BCL |
| 1.5–2 kW | f=150mm | f=200mm | f=100mm | 0.5–6mm | Han's, Bodor, Raytools BT240 |
| 3 kW | f=150mm | f=200mm | f=100mm | 1–10mm | Han's BM110, Bodor, Precitec YW30 |
| 4–6 kW | f=150mm | f=250mm | f=100mm | 1–16mm | Precitec ProCutter, Raytools BM111 |
| 8–10 kW | f=200mm | f=300mm | f=100mm | 3–25mm | Precitec ProCutter 2.0, Trumpf BM |
| 12–15 kW | f=250mm | f=350mm | f=100mm | 6–40mm | Precitec, Han's high-power series |
Common lens diameters
| D27 / 27mm | Most Raytools & Bodor heads |
| D28 / 28mm | Precitec ProCutter, YW30 |
| D37 / 37mm | Han's BM110 series |
| D50 / 50mm | High-power heads, large aperture |
Lens substrate & coating
| Fused silica (FS) | Standard for 1–10kW; low thermal expansion |
| ZnSe | Legacy CO₂ lenses — not used in fiber heads |
| AR coating | Anti-reflective — reduces beam loss, standard spec |
| IAD coating | Ion-assisted deposition — higher damage threshold for 8kW+ |
Power down and let the head cool
Never remove a lens immediately after cutting. Let the head cool for at least 5 minutes. Use gloves from this point forward — never touch optical surfaces with bare hands.
Remove and inspect in clean air
Remove the lens cassette per your head manufacturer's procedure. Inspect under a penlight at an angle — looking for spatter spots, burn marks, or coating damage. Minor haze can be cleaned; burn marks cannot.
Clean with optical-grade IPA and lint-free wipes
Use 99%+ isopropyl alcohol and optical-grade lint-free lens wipes. Use a single drag stroke — never scrub. Start at centre, pull to edge. One wipe per pass.
Inspect again before reinstalling
Re-inspect under the penlight. If contamination remains, repeat with a fresh wipe. Two or three passes maximum — if it doesn't come clean, the lens needs replacing.
Reinstall with correct orientation
Many lenses are directional — the coated face must face the beam correctly. Check your head manual for orientation arrows. Incorrect installation can cause catastrophic lens failure.
Shop fiber laser lenses
OEM-compatible lenses in stock — focusing, collimating, and protective windows. Ships same day from Canada.