How to use a Laser Grid

The theory

Put a laser grid against a wall or light up a room, and if something passes in front of it, it will block out sections of the grid. Great for detecting movement, shadows, or solid shapes moving in the room.

Okay, let’s break it down.

First of all, great choice on the colour GREEN. As most people know, green is the most visible colour of laser.

How do they work? They are “diode pumped solid state frequency-doubled”. The laser runs through a series of diode crystals and dielectric mirrors that pass through a resonant cavity. IR radiation is then blocked by an infrared filter behind the mirror, and then eventually passes through a collimator lens.

Of course it is a WHOLE LOT MORE complex than that, but you get the idea.

You have two options when it come to using the lasers. The first option is the popular laser pen. The second, a plug in laser device commonly used by DJs in night clubs. We’re going to be talking about the laser pens in this next section.




Easy To Transport

Cheap – (well maybe not so cheap, keep reading)


Not meant for continuous use

Diode Over Heating

Short Battery Life

False Positives

When using a laser pen, keep in mind what they are intended for, star pointing, etc. They have no efficient way of cooling down.

When using the laser pen for extended periods of time, (longer than the recommended 10 minutes), the laser begins to produce heat. The diodes in the laser pens are small, and there is no cooling system to stop the diodes from overheating and failing. When they begin to fail, some of the grid may start to fade, which can lead to false positives for the paranormal investigator. It is recommended that for every 10 minutes of continuous use, it will need to be turned off and cooled for 3-5 minutes.

There is no indicator on battery life for the laser pens. The only way to tell is when the beams begin to fade. When this happens, there can be a “twinkle” effect in your grid. Example, we all know that stars do not twinkle. It is the scintillation that causes them to appear to twinkle. This is from the light having to pass through thick layers of turbulent air. In the case of the laser pen, as a diode starts to die, or the battery starts to fade, the amount of energy being created for the laser has this same effect. If you are an avid investigator, and can keep up with changing the battery often, or stopping your laser to cool down after an hour or so of use, then you should have no problem.

Courtesy of Nikki Hyslop  

Psychopomps Paranormal South Coast

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