With ultrafast laser we normally get a smooth and white sidewall and edges of laser cutting, but for some thick ceramics substrates we have to cut with fiber or CO2 lasers, and there is burs and black oxides around the edges and sidewall how to clean it completely?
We have tried some acid and sodium carbonate, but still yellow marks left
Thanks
Perhaps you could try plasma etching in an argon plasma. Argon sputter cleaning is used in the semiconductor industry in various applications.
The reason for a "cleaner" LASER cut with pico or femto-second pulsed LASERs is because the pulse of light is too fast for the molecular interaction between the incident photons and the molecular structure of the material/substrate (the photon pulse is much faster than the molecular vibrations). With the CO2 LASER it is long pulse (greater than nanosecond) or CW and therefore the incident photons are on the same time scale molecular vibrations in the material and thus interact with the molecules causing them to vibrate to the point of breakdown. The fast LASER pulses are on a quantum time scale (electronic dipoles only), which means they interact with material at a quantum level (energy is always conserved); this creates a plasma plume that ejects the obliterated material. For transparent bulk materials (crystalline or amorphous glass) if the intense pulse is below the surface there will be no obliteration, but rather a deformation in the dipoles of the material causing an index modification.
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