Tile, Glass, Stone: Fiber Approach
Hit-and-miss territory on fiber. CO2 is generally the right tool for glass, ceramic tile, and stone, see CO2 → Tile (Norton White Method), CO2 → Glass, and CO2 → Stone & Slate for production-quality workflows. This module covers what's possible on fiber when CO2 isn't an option, and where fiber actually beats CO2.
Decision matrix: which laser for which job?
| Job | Best laser | Why |
|---|---|---|
| Norton White Tile method (TiO2 spray on white tile) | CO2 | The titanium dioxide spray fuses to the glaze under CO2's 10.6 µm absorption band. Fiber doesn't fuse the spray as cleanly. |
| Frosted glass / glassware (wine glasses, tumblers, beer mugs) | CO2 | Even, controllable frost from CO2. Fiber tends to micro-fracture glass. |
| Slate photo plaques / pet memorials | CO2 | Higher contrast, smoother gradients, larger field. See the Slate Photo Plaque tutorial. |
| Marble / granite / dark stone | CO2 | Wider field, faster, better dither rendering. Fiber works but slower. |
| Dark glazed ceramic tile (small areas, no spray) | Fiber OK | Fiber's tighter spot resolves fine text on dark glaze where CO2 needs the TiO2 spray for contrast. |
| Crystal / lead glass / cut crystal awards | UV laser preferred | UV (355 nm) does sub-surface bubblegrams in crystal that neither fiber nor CO2 can match. CO2 is second-best; fiber is third. |
| Mosaic tile pieces (small, batched) | Fiber on dark tile / CO2 with Norton on light tile | Pick by tile color and finish. |
Glazed ceramic tile (fiber direct, no spray)
Fiber will fracture the glaze on most ceramic tiles, leaving a frosted/etched mark. Works best on dark glazed tiles, the contrast comes from the frost against the dark base color. Light tiles need the Norton White Tile method (CO2 + TiO2 spray) for production quality.
| Param | Starting value (60W MOPA, 70mm or 110mm) |
|---|---|
| Speed | 300-500 mm/s |
| Power | 60-80% |
| Frequency | 30-50 kHz |
| Pulse width | 200 ns |
| Line interval | 0.025 mm |
| Passes | 2-4 |
Fracturing the glaze is permanent and rough-textured. Run a test grid on a sacrificial tile from the same batch, glaze chemistry varies wildly between manufacturers and even production runs. Wear safety glasses (glass spall + UV).
Glass (bottles, jars, drinkware)
Fiber tends to micro-fracture glass surfaces. Don't try to deep-engrave glass on fiber, chips will lift and the result looks shattered, not engraved. For decorative frosting on bottle glass, light settings work:
| Speed | 200 mm/s |
| Power | 40-50% |
| Frequency | 60 kHz |
| Pulse width | 100 ns |
| Line interval | 0.05 mm |
| Passes | 1 |
Test on a scrap bottle of the SAME glass formulation as production, Coke bottles ≠ wine bottles ≠ mason jars. CO2 with the wet-paper or dish-soap technique (see CO2 Glass module) is more reliable for production glassware.
Stone: slate
Slate marks beautifully on fiber, instant bright white against the natural dark slate. The mark is the result of the laser ablating surface organics and exposing fresh mineral underneath. Multiple passes deepen the white but don't add depth (slate is dense and laminar; deep engrave shatters layers).
| Speed | 300-500 mm/s |
| Power | 30-50% |
| Frequency | 30-50 kHz |
| Pulse width | 200 ns |
| Line interval | 0.04 mm |
| Passes | 1-2 |
Stone: marble
Marble engraves but is fragile under heat, too much power cracks it. Reduce power and use multiple passes for depth. Light marble shows mark via heat-darkening; dark marble shows white frost.
| Speed | 300-400 mm/s |
| Power | 25-40% |
| Frequency | 30 kHz |
| Pulse width | 200 ns |
| Line interval | 0.04 mm |
| Passes | 2-3 (lower power per pass = less crack risk) |
For production marble work (memorial markers, awards), CO2 with a longer-focus lens delivers cleaner results at scale. See CO2 Stone & Slate.
Common pitfalls
- Trying to deep-engrave glass. Don't. Glass fractures unpredictably under fiber's pulsed energy. Use frost settings only.
- Skipping the scrap test on a new tile/stone batch. Glaze chemistry, slate density, and marble grain vary by batch. Always test first.
- No safety glasses for glass/ceramic work. Glass spall is real; UV-rated OD 5+ glasses for 1064 nm.
- Grayscale on stone instead of dither. Dither (Jarvis) renders stone photos cleaner than grayscale on fiber. See Image Modes & Dithering.
Verified against community-validated fiber recipes; verify on your specific batch with a test grid before production.