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There are also some fairly easy do-it-yourself laser alarms that you can put up just about anywhere. YouTube is full of DIY project tutorials on how to make simple security systems out of a laser pointer.

It's actually fairly easy to create your own homemade laser security alarm using something as simple as a laser pointer. These are created by setting up the laser pointer and reflecting it against a light sensor. This sensor is hooked up to a circuit board of some kind, which then talks to a computer that has been coded to do an action (whether that means sounding a buzzer or sending you a text message). When the beam of the laser pointer is broken, a switch will flip on the circuit board, which will then trigger the computerized response, notifying you of any intruders in the area.