Please keep the list in the loop.
You can look at the fix ttm command which
models electrons (as a background, not as
explicit particles). Paul can comment
as to whether your model makes sense to him.
I don’t know what heating the electrons would
You could think of your laser pulse as essentially instantaneous and happening before your MD simulation starts. Then you could have all of the laser-deposited energy already in the electron subsystem in the form of a higher temperature. So you would be simulating the effect of the laser after it deposits its energy into the electrons and how that energy then couples into the atoms as well.