please make a 7second laser for me.
This is a place to request sound samples, not light samples.
So what's wrong with all the existing "laser"-like sounds already on freesound? If you really want someone to create a sound for you, describe what you're looking for, I mean listening for.
Just between us, out of curiosity I went browsing through those, and others labelled with such tags as "death-ray" and "ray-gun", and I was finding it difficult to locate the kind of sound I would imagine people might go looking for under these tags. So I create a few myself and uploaded them. One in particular that is more of what I had in mind can be found here, once moderated: http://www.freesound.org/people/zimbot/sounds/177026/
I put a warning on it, tongue-in-cheek, but you might seriously want to lower the volume before giving it a listen, lest your brains explode from it (it is, after all, a sonic death ray).