How to build an optical/light barrier with the Arduino, the Keyes laser module (KY-008) and a laser receiver/detector module - Michael Schoeffler
10pcs 3v-5v 650nm Adjustable Mini Laser Sensor Module 5mw Arduino Red Laser Spot Diode Copper Head Level Meter Ground Wire Meter - Sensors - AliExpress
Laser Light Security System Using Arduino with Alarm
KY-008 Laser and Laser Detector - YouTube
arduino uno - Control laser diode from digital pin - Arduino Stack Exchange