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EN 207 is the European norm for laser safety eyewear. Any laser eye protection sold within the European Community must be certified and labeled with the CE mark. According to this standard, laser safety glasses should not only absorb laser light of a given wavelength, but they should also be able to withstand a direct hit from the laser without breaking or melting. In this respect, the European norm is more strict than the American norm (ANSI Z 136) that only regulates the required optical density. More precisely, the safety glasses should be able to withstand a continuous wave laser for 10 seconds, or 100 pulses for a pulsed laser.
Additional recommended knowledge
An EN 207 specification might read IR 315--532 L6. Here, the letters IR indicate the laser working mode, in this case a pulsed mode. The range 315--532 indicates the wavelength range in nanometers. Finally, the scale number L6 indicates a lower limit for the optical density, i.e. the transmittance within this wavelength range is less than 10-6.
Laser working modes
EN 207 specifies four laser working modes:
The scale numbers range from L1 to L10, where the number is a lower limit for the optical density, i.e. Ln means that OD>n, or T < 10 − n, where T is the transmittance. The minimum scale number for a given laser depends on the working mode and the wavelength as follows:
From the scale it can be inferred that the power densities that correspond to n = 0 are considered safe without protective eyewear.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "EN_207". A list of authors is available in Wikipedia.|