How to change this limit, currently max 20% and cannot be increased???
Welcom @max-bit .
That power is only for when you press the Fire button or when Framing, isn´t LightBurn Power limit.
For testing purposes check the Docs:
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With your diode laser, an appropriate setting there would be 0.5% or even less (mine are all 0.25%).
But for some reasons (laser power measurement) I would like to have a special attachment with the ability to fully adjust the power from 0 to 100%
What you are looking for is a Material test.
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You can either use a small circle or line set at the desired power and set it to hundreds of layers, which should it make run long. Or you can just manually generate a PWM signal with another microcrontroller or simple potentionmeter (0-5V usually for diode lasers).
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- Any pwm voltage over it’s TTL on voltage will turn the laser on
- How does wiring a pot help here?
- Can you show me how to wire it in?
For normal operation, @jkwilborn is correct. A diode laser is clocked at 1-1.5 KHz, and the duty cycle is what the PWM is adjusting.
However, a diode laser output can be voltage adjusted. I did it with a 5w module during some diagnostics. Unfortunately that voltage range is very narrow and mostly useless for control. That is why they used PWM.
If you want to vary the beam strength, you need to build a controller circuit where you can set the frequency and vary the ratio of the on-to-off time. If you do not have an oscilloscope, calibration is going to be difficult.
You’re right, it’s not technically correct to use an analogue voltage. And I guess it won’t give nice and linear results. Though I powered such modules already with constant voltages, and they fired. But I did not do any thorough tests. Using a PWM generator would be the correct way 
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Using a dc excited co2 will allow you to set it’s power level, but a diode is generally just driven off the pwm, just like a metal tube or rf machine. Once it thinks it sees a high on that pin, it turns on.
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