LASER SAFETY
110
AREX™ 400
N.O.H.D. DETERMINATION AND O.D. OF PROTECTION
GOGGLES
In order to determine the characteristics of the protection goggles, it is essential to
determine the characteristics of the radiation, knowing its optical path, the dimensions
of the beam and its divergence.
Objective
Scanning Head
Beam-Exp
Source
It is very important to know the real divergence of the laser beam at output of F-Theta
scan lens.
With all this optical data available, it is possible to calculate the Nominal Ocular Hazard
Distance (N.O.H.D.) and the optical density (O.D.) required by the laser radiation protec-
tion filters (goggles).
Below calculations have been done following the CEI EN 60825-1 (2014) Normative
regarding nominal distance and optical risk in the worst condition and in case of acci-
dental exposure of 10 seconds for direct radiation and 100 seconds for diffused radia-
tion.
RIF
1070 nm (± 10 nm)
1065 nm (± 15 nm) for Arex™ A20-X6X
1120 nm (Raman emission)
Q-Switched fiber laser
MOPA fiber laser for Arex™ A20-X6X
Direct radiation
1 mJ @ 10 kHz for Arex™ 110-XXX
1 mJ @ 20 kHz for Arex™ 120-XXX
1 mJ @ 30 kHz for Arex™ 130-X6X
1 mJ @ 50 kHz for Arex™ 150-X6X
0.75 mJ @ 30 kHz for Arex™ A20-X6X
100 ns
250 ns for Arex™ A20-X6X
DL
~ 6.0 mm
2
0.8 mrad
F
160 mm
3
31.2 mrad
10 s
± 20° each axis
Wavelength
Laser Type
Observation type
Pulse energy
Pulse duration
Beam Diameter at F-Theta lens exit
Beam divergence on the lens
Focal of the F-Theta lens
Real divergence after the lens
Exposure time
Max beam scanning angle