All the Greenies here are 532nm, as for tripods I use a few types. For my DSLR I use a proper tripod, either SLIK or Hanimex depending on how windy it is. For my lasers though it's a case of whatever I can find with a decent panning arm and adjustable height for under £10. I've noticed a lot on ebay coming up for £6 or so with free postage. After that I just buy some crab type studio clamps and I'm away!
My next project is going to be photographing a few higher powered lasers down at a weir I've discovered. There are multiple levels near the river, so I'm hoping to reflect and refract plenty of beams. There are 2 bridges also which will look interesting in LE shots. I may only use 4 or 5 lasers, though potentially I could be using more :beer: