Laser Safety
vi
6. Warning statement label.
7. CAUTION logotype.
8. Requires means to measure level of laser radiation intended to irradiate the
body.
9. CAUTION if 2.5 mW cm
2
or less, DANGER if greater than 2.5 mW cm
–2
.
10.Delay required between indication & emission.
11.Variance required for Class IIb or IV demonstration laser products and light
shows.
12.DANGER logotype.
13.Required after August 20, 1986.
Use Precautions
• EN60825-1
*With respect to the requirements of remote interlock connector, key con-
trol, beam attenuator, and emission indicator, Class 3B laser products not
exceeding five times the AEL of Class 2 in the wavelength range of 400 nm
to 700 nm are to be treated as Class 3A laser products.
Note: This table is intended to provide a convenient summary of requirements.
See text of this standard for complete precautions.
• ANSI Z136.1:1993 “American National Standard for the Safe
Use of Lasers” Control Measures for the Four Laser Classes
Requirements;
Sub-clause
Classification
Class 1 Class 2 Class 3A Class 3B* Class 4
Remote interlock Not required Connect to room or door circuits
Key control Not required Remove key when not in use
Beam attenuator Not required When in use prevents inadvert-
ent exposure
Emission indica-
tor device
Not required Indicates laser is energized
Warning signs Not required Follow precautions on warning
signs
Beam path Not required Terminate beam at end of useful length
Specular reflec-
tion
No requirements Prevent unintentional reflec-
tions
Eye protection No requirements Required if engineering and administrative proce-
dures not practicable and MPE exceeded
Protective cloth-
ing
No requirements Sometimes re-
quired
Specific re-
quirements
Training No requirements Required for all operator and maintenance per-
sonnel
Control measures Classification
Engineering Controls 1 2a 2 3a 3b 4
Protective Housing (4.3.1) X X X X X X
Without Protective Housing
(4.3.1.1)
LSO (see note 2) shall establish Alternate Controls
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