I’d asked for grade/# of plys, not thickness. For the same thickness and type of base wood, there are many configurations with multiple variables including # of plys/layers and type of adhesive used. I’ve found the latter can greatly affect whether you can laser cut a sheet in one, clean pass.
I use B-BB grade. I think it is six ply, so 1mm per layer. I get it at Paxton Lumber in a 5’x5’ sheet for about $15.
I’ve never tried to laser cut it, but it cuts clean on the CNC router and common woodworking tools.
Bitbuckets can probably talk about laser cutting, since they routinely make their whole robot out of laser-cut plywood.
1640 has used 6mm 5 ply Baltic birch plywood laminated with 5.7 OZ plain weave carbon fiber since 2011. Light, very very ridged and tough. Do we have to do it? No but we use it as a learning experience in composite construction. The cost of carbon fiber has come down in recent years and is with in the means of teams. We vacuum bag it on a piece of glass. Now days there are many videos and websites showing how to do it. A vacuum pump is needed for the best results. Harbor Freight has a cheap vacuum pump that is good enough for casual use. If you choose the right epoxy, System 3 or similar, the MSDS is fairly benign. Beware that some Areospace epoxies require special safety procedures. I try to get every student in the program to participate in the lay up before they graduate. For us, the belly pan is a structural element incorporated into the design. We have lasered and cnc routed it. Do pay attention to dust when cutting. Woodcrafters is 400yds. down the street. Very convenient vendor. The increase in strength is such that lower grade plywood could also be used. Try it you’ll like it.