The second type is more easy to design and use and different circuits for their implementation exist.
Diy laser driver ttl.
In other words if you have 3 5v output with 50 duty ratio the laser will work with 50 power and the same will be if you have 24v output pin and 50 duty ratio.
For example ttl will activate the laser at any voltage in this range at any duty ratio without changing the laser power.
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Check the fixed focus module test.
Software for laser cutting engraving.
15w 450nm 15000mw blue laser driver board with ttl for diy laser engraver 15w laser module circuit control.
Just showing my connections from arduino cnc board to the ttl laser driver board.
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For the driving of the laser diodes ld special drivers circuits are used.
They can work in two ways.
2 produce constant current driven through the ld load.
This pwm to ttl laser module is design for eleksmaker series machine and its controller board.
But it can also be used for other diy machine which need to change ttl modulation.
1 produce constant regulated voltage.
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15w 450nm 15000mw blue laser driver board laser driver with ttl for diy laser engraver 15w laser module 4 7 store.
Diy engraving machine makeblock xy 2 0 plotter wanhao duplicator i3.
Hope this helps you set you system up and get it working.