Quarton Direct Green Straight Line Laser Module VLM-520-55 LPO (Non-DPSS Green Line Laser Module: Operating Temperature Range : -4 °F ~ 140 °F): Amazon.com: Industrial & Scientific
Amazon.com: 12v 450nm 10W High Power Laser Head Module for Metal, Wood, Ceramics, Acrylic Engraving : Industrial & Scientific
High Power 520nm-1000 Green Dot Laser Diode Module with Cooling Fan for Clothes Cutting/Wood Cutting/Mechanical Positioning (Laser Module + Adapter + Bracket): Amazon.com: Industrial & Scientific