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Laser eye safety and fire

Lasers injure eyes, start fires, and make toxic smoke. This page expands the practical rules we already stress in ventilation and safety — especially eyewear wavelength matching and fire discipline — for CO₂, fiber, and UV shops.

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Eyewear: wavelength first, tint second

Source (typical) Ballpark wavelength Eyewear must match
CO₂ ~10,600 nm CO₂-rated OD for that band
Fiber ~1064 nm NIR/fiber-rated — not CO₂ glasses
UV galvo often ~355 nm UV-rated for that band

Dark green plastic that “came in the box” is not automatically correct. Check the marked wavelength range and optical density (OD) against your laser. Enclosed Class 1-style cabinets with certified windows still deserve respect — do not defeat interlocks.

Reflections count

Class 4 accessible beams can injure via specular reflection. Jewelry, unfinished metal, and open doors are not fashion choices during a job.

Fire

Organic cutting (wood, paper, acrylic) is where most shop fires start. Community safety writing and makerspace practice agree:

  • Never leave a cutting job unattended
  • Keep a suitable extinguisher within reach; know whether to kill power first
  • Clean beds so scrap is not tinder
  • Use air assist where it reduces flare-ups
  • Know what you are cutting — PVC/vinyl remain hard stops (what you can laser)

Fiber marking on bare metal is lower fire risk than CO₂ wood cutting, but coatings, fixtures, and paper jigs still burn. UV glass work still needs the same “stay present” habit when organics are in the field.

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Fumes (short reminder)

Eyewear does not filter lungs. Exhaust outdoors or use a filter system maintained on schedule. Acrylic, MDF, and coated metals all produce junk you should not casually breathe.

Training and access control

  • Brief anyone who “just wants to try a keychain”
  • Post wavelength/OD requirements on the enclosure
  • Keep spare correct eyewear, not a junk drawer of unknown glasses
  • Log near-misses (flare-ups, defeated interlocks) so habits improve

We are a shop sharing practical norms — not your laser safety officer. When in doubt, hire a qualified review for your facility.

Sources and further reading

Go further

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