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Of course, fluences must be increased when tackling deeper ink. But any micro-scarring at depth will not be readily visible at the surface.
Fluences required for shorter pulses, less than 10 ns
Conclusion
Shorter pulsewidths require lower fluences to induce the reaction on the ink particles, but all wavelengths can be used to tackle all ink colours, if sufficient fluence is applied.
It is likely that short pulsewidths add more energy into the individual ink particles, before the steam production prevents further absorption (see my BMLA presentation on this stuff).
Hope this helps, Mike.
Mike’s Blog Posts 141
