Are you trying to do it via actual light ray refraction, volumetric lighting, etc? I'm thinking it's probably faster and easier to just fake it with some geometry. Can you share a picture of the sort of effect you are trying to accomplish?
Technical Director - C4D, Maya, AE, - Washington DC
Yes Scratch. Fake it. imho, it would be a nightmare to get a physical laser beam in Octane. And fake beam would likely render waaaaaaaaaaay the hell faster than a real one.
I think I'd probably use geometry to generate a matte pass for the beam, then use that matte to fake all the glow, transparency, speckles, etc. in post. If the beam needs to provide actual illumination in the scene, I'd do a separate pass with an emission material assigned to the beam geometry.
Technical Director - C4D, Maya, AE, - Washington DC