Laser Classes

Class 2 laser components

Class 2 laser components are considered to be safe, provided that:

The user’s blink reflex can terminate exposure (in under 0.25 seconds).
Users do not need to look repeatedly at the beam or reflected light.
Exposure is only accidental.

Class 2M laser components

Class 2M laser components should not cause permanent damage to the eye under reasonably foreseeable conditions of operation, provided that:

No optical aids are used (these could focus the beam).
The user’s blink reflex can terminate exposure (in under 0.25 seconds).
Users do not need to look repeatedly at the beam or reflected light.
Exposure is only accidental.

Class 3R laser components

Class 3R laser products emit radiation where direct intrabeam viewing is potentially hazardous, but the risk is lower with 3R lasers than for 3B lasers. Fewer manufacturing requirements and control measures for 3R laser users apply than for 3B lasers.

Eye protection and protective clothing are not required.
The laser beam must be terminated at the end of an appropriate path.
Avoid unintentional reflections.
Personnel must be trained in working with laser equipment.

Class 3B laser components

Class 3B components are unsafe for eye exposure.

Usually only eye protection is required. Protective gloves may also be used.
Diffuse reflections are safe if viewed for less than 10 seconds at a minimum distance of 13 cm.
There is a risk of fire if the beam encounters flammable materials.
The laser area must be clearly identified.
Use a key switch or other mechanism to prevent unauthorized use.
Use a clearly visible indicator to show that a laser is in use, such as “Laser in operation.”
Restrict the laser beam to the working area.
Ensure that there are no reflective surfaces in the working area.