You seem to be missing something. Should not the 24v (-) and controller (-) be tied together? Otherwise, you have no common between the Laser and the controller for the PWM signal.
Good catch. That diagram was part of a bigger one that included the volt/amp meter, and it showed the grounds tied together further upstream. It was a case of “well, I know they’re tied together”. I’ll get it corrected, thank you for bringing it to my attention.
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