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Laser Safety FAQ

Laser classes

Depending on their hazardousness, laser systems are rated a certain laser class. Dangerous laser classes are 3B and 4: Additional safety measures are required, depending on the local laser safety regulations.The manufacturer of a laser system is responsible for its correct classification - the classification only applies for the laser system and does not say anything about the actual...

What does "AR" stand for?

AR stands for Accessible Radiation. The laser class of the projector is specified according to the Accessible Radiation (AR). It is the maximum possible emission that may exit the laser aperture. Limit values are given in IEC 60825-1 „Safety of laser products, part 1".The MPE in contrast to the AR references the laser immission in public area - which is completely different!Please also see the...

In Germany, do I need TÜV approval for every laser show?

No. In Germany there is normally no TÜV approval/assessment necessary. It is important to inform the regulatory authority (Ordnungsamt) about the laser shows that is going to happen. If this authority requires a formal approval through an official agency (which normally only is the case for installations like in nightclubs or larger public venues), there may be the need of a more formal...

Laser damaged camera sensor / video projector - was it dangerous for human eye as well?

 If your camera sensor or video projector has been damaged by laser beams, the show was not necessarily dangerous for human eye:Camera sensors and video projector LCDs are much more sensitive to light impact than human eye.If filmed from a distance, lasers normally don't harm camera sensors, but if you zoom into the beam, the optics act like a burning glass - and focus the already very sharp...

Do lasers damage video or photo cameras?

Yes, lasers can damage video cameras.This is due to the very focussed rays. A video camera has a very sensitive sensor to transform the immitting photons to electronic impulses. Laser beams have a very high energy density in the point where they hit the camera sensor. The distance to the laser is a crucial factor: The farer away from the laser source, the less dangerous is it to film the laser...

How does the interlock work in Laserworld projectors?

The interlock is a safety option in laser projectors to provide a proper option to connect a safety shut-off button to the laser. The connector used with all Laserworld systems is a D-sub (DE-9) standard connector, with a quite simple pinout: If pin 1 and 2 are linked, the laser output is active. If there is no connection between pin 1 and 2, the output is interrupted.   All projectors...

What does "MPE" stand for?

MPE is short for Maximum Permissible Exposure. The MPE is the level of laser radiation, that, under normal circumstances, persons may be exposed without suffering damage. In general the MPE is laser class 2, meaning max. 1mW. In some cases class 3R, meaning 5mW.Physically the standable exposure for human eye is very much above, but legal situation defines the MPE as shown above (IEC 60825-1)It...

Why does Laserworld always give minimum and maximum values for their laser products?

It is physically not possible to give exact power values of show lasers, as several factors influence the power. Especially DPSS (Diode Pumped Solid State) laser modules are quite sensitive to exterior influences like temperature and excessive shock. DPSS modules consist mainly of three sections: - a pump energy source (where there may be slight differences in power), - a resonation area (that...

Do I need special knowledge to operate a laser projector?

In general there is no deeper knowledge necessary to operate a laser projector in a physical sense. However, laser light may be quite dangerous if it is not properly used. Due to the coherence of the laser light (same direction and wave characteristics of the light - different to normal light sources), the very sharp rays can be dangerous to human eye or immission sensors.However, if you respect...

What is the required minimum distance to a laser projector to do a safe laser show?

There is no general value available to determine the actual necessary distance. There are many factors relevant for the actual determination. Please see only a few: Scanspeed, point rate, scanned pattern, beam divergence, output power of the laser projector, beam diametre at aperture, etc. Internationally the IEC 60825-1 Laser Safety Regulation applies. It defines the power of laser class2 in...

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