This is interesting and looks like it was a fun project, but it looks a little complicated to be practical for me personally. I currently just put a screen over a large fan and open a bottle of carbonated water to attract them near the screen. The fan/screen can kill (starve) tens of thousands of them per day and their carcasses can be used in plant fertilizer. The downside of my method I suppose is that the fan will use more power than your laser by quite a bit.
[Edit] Apologies to the parent poster. I did not mean to derail the laser discussion.
[Edit] Apologies to the parent poster. I did not mean to derail the laser discussion.