532 nm filters: I have been building a number of 532 nm lasers. There have been questions about filters to remove the IR component and just wanted to pass a little information along to those who are interested. I use IR filters in all my builds and if you are looking for some there are a quantity or 5 IR filters 9.5 mm square and 1.1mm thick on eBay item # 110887324982 for $15.98. These filters have a high transmission for 532 nm >97.5% and a low transmission of IR at 808 nm and 1064 nm <2%. Just wanted to pass that along to anyone interested in building these DPSSLs.