GOOD TO KNOW :
The class of a laser is the first information given on the dangerousness of a laser. This information is easily accessible because it is mentioned directly on the laser device as well as on its instructions for use. This is a regulatory and normative obligation for the manufacturer.
The notion of class can apply both to a laser device and to emitted radiation.
These classes come from standard NF EN 60825-1 and are defined according to the maximum level of illumination of the laser source, also called the accessible emission limit (LEA). The Standard has an appendix: appendix C, which presents the potential hazards associated with the classes.
The notion of “without danger” is linked to the absence of lesion. However, itThe beams can be the source of intense glare.
Generally, the following precautionary principle applies: Do not stare directly and for a long time into a light source, whateverand whatever she is.
Classification of lasers:
According to EN 60825-1: 2007, laser devices are classified into the following categories: 1, 1M, 2, 2M, 3R, 3B, 4
: The laser is safe under all conditions of normal use. No security measures are necessary.
: These lasers are not considered dangerous if the direct exposure does not last more than 0.25 s. Do not deliberately look into the beam for a longer period of time. This class is only defined in the visible range: from 400 to 700nm wavelength with a maximum power of 1mW (1milliWatt).
The beam is widened. In the visible range 400 -700nm with a maximum output power of 5mW (5 milliWatts), the level of risk is identical to that of class 2. Do not look into the beam. Do not use optical aids: they can concentrate the beam and endanger the eyes. The same safety requirements as for laser class 2 apply, but the user should also ensure that no optical instrument which would reduce the beam diameter is used to observe the laser beam.
Class 3R laser equipment, like Class 3B, is potentially harmful to the eyes. The risk of eye damage can be reduced by restricting the accessible emission limit (LEA) in visible wavelengths to five times the LEA for class 2 and restricting the LEA in all other wavelengths to five. times the LEA for Class 1. During use, the harness should end at the end of a suitable path. Avoid any unintentional thinking. Class 3R laser equipment, like Class 3B, is potentially harmful to the eyes. However, there are no special requirements for eye protection (e.g. laser protective goggles) or protective clothing, as the output power is limited to five times the emission limit accessible for Class 2. Operators and maintenance personnel must be trained to work with laser equipment.
LASER CLASS 3B Medium power laser systems. Danger to eyes and possibly to the skin. Avoid exposure to the beam. Scattered radiation is not dangerous at a minimum viewing distance of 13 cm and for a maximum observation time of 10 s. There is a possible fire hazard if the beam crosses flammable materials. Output power up to 500 mW. When installing equipment or working in the laser area, suitable personal protective equipment must be used (laser protective glasses, and if necessary protective gloves). The laser area must also be identified with appropriate warning signs. Laser equipment must be secured against unauthorized use, eg. using a key switch or similar mechanism. A clearly visible visual indicator, eg. "Laser on", should be used to indicate that the laser is in operation. The laser beam must also be limited to the necessary working area. There should be no reflective surfaces in this area. A laser safety officer should be appointed and a notification should be sent to the relevant professional organization and the relevant occupational health and safety authorities before the laser is used for the first time. In Germany, laser safety training courses are offered by TÜV, trade associations and other similar organizations.
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