You could get a diffraction pattern of a small slit or wire ( human hair works). Experiment with double slits, and many more.
You could try to burn something, but you need a good lens and exact alignment.

Its usual operation wavelength is 632.8 nm. Red part of the spectrum. So no chemical reactions that i can think of will occur (except very photosensitive materials).

With a crystal of potassium titanyl phosphate and complicated assembly you could double it's frequency ( 316.4 nm ).

holograms?