Comment by xyzzy123

> Is there any good literature about “burning” nonuniform durable materials in a rotary disc burner

Not that I'm aware of. A DVD write laser is maybe 200mW so it's not going to be able to engrave most materials or do it VERY slowly at best. The spot size is ridiculously small though (this is good) so they are still interesting.

Most people interested in light wood or thin plastic applications have moved on to the small 5-20W diode laser form factor, these are available for a few hundred dollars if you aren't too worried about safety (e.g. no kids in the house). Something with a proper enclosure, interlocks and air handling costs more but still sub $1k. The spot size is much bigger than a DVD laser though; you can't get anything like the same resolution.

Modding a DVD laser has much higher hack value but it seems to have gone out of style as hobby lasers became widely available as a product.

Re: materials, if you are not on the "happy path" (material supported by manufacturer or specifically designed for laser) you have to get samples and test.

There's a few different interactions with laser spot size, wavelength, power, passes etc and the material which means different people (with different systems) tend to get different results. The variability limits the "shareability" of results; probably the biggest sources material info / laser settings are in the forums of the laser manufacturers because it makes the most sense to share settings with other users of the same system.

As you noted, glue and nonuniformity are a big thing, most materials aren't designed to be burned / vaporised. For glass specifically I think the most practical way would be a CO2 laser which is different again.