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Not sure if it is of any help but I am working on a firmware for my CO2 laser that allows for the mapping of power levels.
Might be an alternative for high powered diode lasers too.
Essentially you set the lowest power level that gives you some visible change as the minimum engraving value in the firmware.
The power mapping happens to a value of max 10000 which allows to spread 256 power levels for the analogwrite command wherever needed.
That way I can even do 8bit engravings on paper without burning through it.
If it is of any help I will give you a link to Github.