We've just found a great module that can give you more possibilities and this is Laser Detector. It can detect laser with the transparent sensor and send high or low output to Arduino. Using with KY-008 Laser Module together you can make it as a switch and instruct Arduino turning on / off something. Doorbell, security system, power-saving light along corridor for instance. You can also choose a package including two modules. Let's try it and discover more possibilites!

KY-008 Laser x Laser Detector