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Can a fiber laser engrave glass?

No – a fiber laser can’t engrave clear glass. Its 1064nm beam passes straight through it without leaving a mark. Use a CO2 laser to engrave glass; here’s why.

The short answer is no — the beam passes right through clear glass. Here’s what to use instead.

Short answer

No — a fiber laser cannot engrave clear glass. Its 1064 nm beam isn’t absorbed by glass; it passes straight through without leaving a mark. To engrave glass — tumblers, awards, panels, photos — you want a CO2 laser, whose 10.6 µm wavelength frosts the surface cleanly. Fiber is the tool for metal and many plastics, not glass. So for a glass cup or any glassware, use a CO2 laser; see our glass-engraving guide for the technique.

A 1064 nm fiber beam enters and exits a clear glass panel with no interaction and no mark, while a 10.6 micron CO2 beam terminates at the glass surface and frosts it into a bright mark
Clear glass doesn't absorb 1064 nm — the fiber beam enters and exits with no interaction — while CO2 terminates at the surface and frosts it into a bright mark.

Why fiber doesn’t mark clear glass.

Engraving needs the material to absorb the beam. Clear glass is transparent to fiber’s 1064 nm light, so the energy passes through instead of heating the surface — no frost, no mark. This is the same reason fiber can’t cut clear acrylic. It’s a property of the wavelength, not a settings problem.

Use a CO2 laser for glass.

A CO2 laser is absorbed at the glass surface and frosts it into a bright white mark — the right tool for glassware, awards, and photos on glass. For the full technique (low power, damp-paper trick, rotary for round items), see how do you laser engrave glass? Keep fiber for metal and plastics.

Related questions

Can a fiber laser engrave glass?

No — a fiber laser can’t engrave clear glass. Its 1064 nm beam passes through glass without being absorbed, so it leaves no mark. Use a CO2 laser, which frosts the glass surface cleanly.

Can you engrave a glass cup with a fiber laser?

No. A clear glass cup is transparent to the fiber wavelength, so the beam goes through it without marking. Engrave glassware on a CO2 laser, ideally with a rotary attachment for the round surface.

Can you use a fiber laser to engrave glass at all?

Not clear glass. The only marks fiber can make on glass-like items are on coatings or paint applied to the surface, not the glass itself. For real glass engraving, a CO2 laser is the correct tool.

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