What is Laser Display System and how does it work?

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What is Laser Display System and how does it work?

The lasers are everywhere around us whether you like it or not. You will find them in so many places and applications that it’s actually surprising. The lasers are used across virtually all industries such as manufacturing, medical, advertising, entertainment, military, automotive etc. Yes, they are everywhere and included in many devices we use in our lives on daily basis.


So the question is: What is a LASER?

And the notoriously obvious answer that some including wikipedia will tell you is: Light Amplification by Stimulated Emission of Radiationbla..bla..bla..

What on Earth that means?

Basically it means that when a suitable medium is pumped with a suitable energy, it will generate a tiniest bit of light. And that tiny bit of light will start a chain reaction within the medium, releasing huge number of tiniest bits of light of the same characteristics, that together form the laser emission.
In reality it’s quite a bit more complicated, but don’t worry about that. What we want to focus on here are the laser display systems, that are used in entertainment industry, so let’s forget about science for the moment.


How the colours work?

There are many different types of lasers, but the ones used in entertainment are mostly diode lasers, working in visible spectrum and mainly producing colours such as Red, Green and Blue. These are three basic colours and by mixing them together it is possible to get secondary colours such as yellow, magenta, cyan and white and all their shades such as Orange. Red, Green and Blue mixed together in correct ratio will result in White.


Why I can see the laser?

The reason why we can see projected laser beam is that the laser light reflects off particles of humidity and dust in the air – and that’s what we actually see – the reflection. Without those particles the laser wouldn’t be visible, no matter how powerful it is. So for example, in a vacuum, all lasers would be invisible because there’s nothing in there they could reflect off.
And that’s why smoke and haze machines are used together with lasers – to amplify the visibility of lasers.
In reasonably thick haze, heavy rain and snowfall, even low power lasers will be nicely vivid.


How do you do all those fancy tunnels, sheets of light and animations?

So now we know what is the laser, how colours work and why we can see the lasers. The last bit we need to have a complete Laser Display System is part that handles the steering of the beam into desired direction and that’s called Scanning System or Scanners.
The emitted and optically shaped laser beam is pointed at the scanning system which is made of two tiny moving mirrors. One mirror steers the beam on X axis and another one on Y axis. That way we can draw shapes with a single laser beam.

If we draw the same shape more than 20 times per second (which is more or less refresh rate of human vision), the shape appears static to us humans, even if it’s made of single fast moving laser beam.


These above are the basic parts of any laser display system, but there’s lot more to it of course. And what distinguishes Dj-disco-party laser from a professional laser display unit is mostly the details. The details that in the end make all the difference.The details that make Kvant Lasers one of the best on the market.