I've extracted several laser diodes from DVD burners. I have no idea how much voltage or current I should run through these diodes with a proper heatsink. I've also extracted a 4 pin laser diode from a GH70N 2012 HL Super Multi DVD rewriter. It only had a one diode but the warnings say it has both class 3A visible and invisible lasers. Could this be a laser diode that can emit both wavelengths? I also have a 2005 laptop DVD/CD burner that has class 3B diodes. Any advice or information on what voltage and current would be appropriate for these diodes with heatsinking would help me greatly as I cant find any datasheets or information on these diodes.