Why wear laser safety eyewear?
Hazards may arise due to accidental reflection of lase radiation e.g. from optical components
or other reflective parts. A reflected beam can be sufficient to cause serious eye damage!
You can prevent eye damage by wearing the correct eye protection and ensuring that all
others person in the area do so too.
What should I look for when selecting laser safety eyewear?
Laser safety eyewear must be marked with the protection level with wavelength range and the CE sign.
To conform to the European Directive 89/686/EEC governing personal protective equipment, a notified body must test and certify the eyewear in accordance to EN 207 bzw. EN 208 and issue a EC-type examination certificate, which indicates the protection levels that the eyewear meets.
The protection offered should be geared to the wavelength of your laser and be suitable for a worst-case scenario i.e. the maximum power density or energy density which the user could be exposed to.
Generally, the smallest accessible beam diameter is used for this calculation. However, in the case of diverging beams, then the beam diameter 10 cm from the divergence point may be used to calculate the power density or energy density.