Problem with laser power output using 5V PWM

Machine: owner made machine_

Board: Cohesion 3D

Firmware: _Smoothie

Problem/ Question: the power output of the laser (chinese 40W) insufficient
at 20% it does nothing… and at 100% the light disappears altogether.
a 20% firing at a fixed point does nothing either
can anyone help?
thanks, Jack

Did you provide those pictures? We need pictures to understand your setup!

sorry I don’t have pictures

Good luck, I can’t get any help out of this forum.

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