Since I was just about ready to make the IC2 Mining Laser, I'd like to know the answer as well, because you have me worried. I used the Mining Laser in a previous play-thru of the modpack and it is just awesome. The whole time I've been playing in this most recent world, one of my goals was to get to the point where I can make that Mining Laser! I'm there now, I've got HV Autoclave and a steady HV power feed, so I can make my Energium Crystals now. But I'll wait to see any replies.
One unfortunate thing is, I'm playing an older version of the modpack with the old recipe (I've been reading that the new recipe requires an Exquisite Diamond or something like that). So my experience isn't really applicable to anyone else, and your experience may not be applicable to me. It's not my server, so I don't get to decide what version of the pack to run.