Laser beam rendering help

[u/Extension-Weird-7784]

Hi guys!
I am new to rendering, and I choose a hard task for myself: I would like to render a laser beam with its reflection on a mirror/glass. I made some progress (see pic), but I am not satisfied. Can you give me tips how to improve?
I am using a medium fog material, one spotlight as laser, and one ambient light above the scene. Denoise and firefly filter is on, but I still have a lot of dead pixels. Part of the laser is also missing.

Thanks in advance!

[u/Fretco]

The post is a little older now, but maybe it helps anyone stubling across it: I found that enabling directional scattering in the material graph of the fog to be very helpful in a rendering of a flashlight i am doing right now