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照明器具 gagalight RGB4000のPDF ユーザーマニュアルをオンラインで閲覧またはダウンロードできます。gagalight RGB4000 18 ページ。 Laser light

What is a laser and how does it work?

What is a LASER?

The laser is a bunch of energy waves (streams of photons called radiation) with the same

amplitude and faze that are flowing in the same direction; meaning they are coherent – they

stick together and form a laser beam.

The width of a single wave is measured in nano-meters and defines the colour and visibility of the

laser beam. The visible spectrum of the human eye is roughly between 400nm and 700nm, going

from violet to a dark red colour. A human eye is most sensitive to a green light of around 555nm,

meaning that a 1W of green laser will always appear more visible than 1W of any other colour

laser. 1W of quality laser light is very powerful and although it doesn't sound like much it can

burn eye retinas, skin and clothes or even start a fire!

What makes the laser visible?

Mainly it is the particles of dust in the air that the laser beam hits on its path. That's why we

"laserists" use haze or smoke machines to make lasers more visible. Too much of the haze or

smoke will kill it, but the right amount will make all the difference between no show and a

great show.When outdoors, lasers mainly reflect off dust and mist in the air but due to

unpredictable wind conditions we can never make sure the hazers or smoke machines will be

effective enough. And that ' s why we use high power lasers for outdoor shows – to

substitute for the lack of dust, haze and smoke.

How far does it go?

Depending on the power output of the system and weather conditions, the laser can be visible

for miles –that is why we need to be cautious about aircrafts when performing outdoor shows.

And if you get a system that is powerful enough then yes, it can reach the Moon.

Colours

Standard full colour analogue lasers use three primary colours: Red, Green and Blue. By

mixing those together you can pretty much get any secondary colour:

Of course the number and precision of the colours is determined by the modulation, stability and

linearity of the system. If the system is not stable enough, it will produce different colours every

time it is used,making it virtually impossible to match the colours of two systems at any one time.

This is very often the case with systems from far east manufacturers and with re-branded lasers

that are being presented as European makes.

Scanning System

A scanning system is essentially two tiny mirrors, each moving on X or Y axis. By working

together they can "scan" the laser beam in all directions. Once a shape is scanned more than

20 times per second, it appears static to the human eye. So any shape drawn by a laser is

actually produced by one single laser beam running around like crazy. Every scanning system

has a mechanical limit of how fast it can move its mirrors and therefore how many points it

can display at any one second and that is usually represented in Points Per Second at a certain

scanning angle, i.e. 8 degrees.

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