With a diode laser like that you’d likely need to drop the focus down a bit after a few passes. Or at the very least start focused on the center of the wood… but then it probably won’t start cutting in the first place as it would be too out of focus. Acrylic will act as a wave guide so you don’t need to refocus as much but not so with wood obviously.
Also, if you are doing this with plywood from the normal hardware store you probably won’t have much luck. The glue they use is much harder to get through, and can actually gum up and become harder to get through as you go. Plus… the fumes are cancerous.
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