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AG Quantum Optics
and Spectroscopy

Details
Published: 13 March 2018

Safety goggles calculator for CW lasers

following European norm EN 207

This calculator is for a single wavelength, continuous wave (CW) laser and cannot calculate safety requirements for pulsed lasers or multiple laser wavelengths. The information is provided for educational purpose only.

Safety goggles that follow the EN 207 norm are labelled with the CE logo.

A short introduction to laser safety goggles can be found on this page.

Laser safety goggle rating calculator (CW)
USE AT YOUR OWN RISK!


*Minimum laser beam diameter to which a person might be exposed under
reasonably foreseeable circumstances (see here for more information).

Test

Quantities used to calculate the correct goggles rating:
λ Wavelength — nm
P Power — mW
d 1/e Laser beam diameter — mm
I Intensity 4P/(πd2) W/m2
A Limiting aperture 1 f(λ) mm
t Exposure duration 2 Visible light: 0.25 s
Invisible light: 100 s
s
Ieff Effective intensity 4P/(π.max(A2, d2)) W/m2
MPE Maximum permissible exposure 3 g(λ,t) W/m2
OD Optical density required log10(Ieff/MPE)  
LB Minimum EN207 scale number 4 h(λ, I)  

1 f is a function given by the IEC 60825-14 (see table on p. 25 of the 60825-14)
2 values recommended by the IEC 60825-14 for direct accidental exposure (see p. 28 of the 60825-14)
3 g is a function given by the IEC 60825-14 (see table on p. 49 of the 60825-14)
4 h is a function given by the EN 207 norm (see this table)


Author: Réouven Assouly.
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