How to Build a Laser (general Guide) : 8 Steps - Instructables
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Amazon.com : NEJE E40 Laser Module for Engraver and Cutter, 11W+ Output, FAC Tech - 2 x Beam, 0.06x0.06 Fixed Focus Spot, Built in High Pressure Air Assist : Arts, Crafts & Sewing
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How to build an optical/light barrier with the Arduino, the Keyes laser module (KY-008) and a laser receiver/detector module - Michael Schoeffler
5pcs/lot KY-008 650nm for arduino Laser sensor Module 6mm 5V 5mW Red Laser Dot Diode Copper Head - Newegg.com