12V Green Diode Lasers 532nm Laser Module Dot with TTL 0-30KHZ & Fan Cooling - Long Time Working: Amazon.com: Industrial & Scientific
450nm 80mW Blue Fiber Coupled Laser High Stability Diode Laser Module
Amazon.com: AENBUSLM 40W Laser Module Kit, 5W Diode Laser Module for Engraver Cutter, Ultra Fine Air Assist Laser Head for DIY Metal Wood Leather Glass, Compatible Most Laser Engraving Cutting Machine, 12V