Non-continuous grayscale engraving

Hi. I finished my laser machine with old 3D printer. I put a SKR 1.4 with Marlin 2.0 (inline mode) and 5.5w laser diode.

I configured the PWN (in P2_00 gpio).

The power of laser works fine. I can get diferents levels of power with PWM.

The problem is I get a “wave” effect. It look like I use a halftone instead grayscale (yes, I use grayscale, I am sure).

The laser is this:

Configuration problem in Marlin? Bad quality of ttl of laser?

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