I try to always avoid making something out of filter, I only use blur and sharpen. Try making a space backdrop instead of that green stuff, also there is a guide somewhere on the internets for making laser beams. Use Google image and search for "Signature Tutorials" best place to get you started I think.*
<div align="right">*If you believed this are you this guy?</div>
I have the lase guide on my computer, I just didn't want to upload it. No idea where the credit goes on this, might even be at the end of the guide. Here you go:
Once you have made the beam, use CTRL+T to shrink it and place it where you need to too be. After you have placed it go to: Filter > Sharpen > Sharpen. That should clean it up, if it still looks off then sharpen it BEFORE you do CTRL+T. I haven't tried the lase beam guide that way, I don't like it's outcome to well. But it's better than nothing, the way I do it takes for AGES to complete anyway.*
<div align="right">*If you believed this are you this guy?</div>