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1
Laser Safety
xvi
ANSI Z136.1:1993 “American National Standard for the Safe Use of Lasers”
Control Measures for the Four Laser Classes
Control measures
Classification
Engineering Controls
1
2a
2
3a
3b
4
Protective Housing
(4.3.1)
X
X
X
X
X
X
Without Protective Hous-
ing (4.3.1.1)
LSO (see note 2) shall establish Alternate Controls
Interlocks on Protective
Housing (4.3.2)
l
l
l
l
X
X
Service Access Panel
(4.3.3)
l
l
l
l
X
X
Key Control (4.3.4)
---
---
---
---
S
X
Viewing Portals (4.3.5.1)
---
---
MPE
MPE
MPE
MPE
Collecting Optics
(4.3.5.2)
MPE
MPE
MPE
MPE
MPE
MPE
Totally Open Beam Path
(4.3.6.1)
---
---
---
---
X
NHZ
X
NHZ
Limited Open Beam Path
(4.3.6.2)
---
---
---
---
X
NHZ
X
NHZ
Enclosed Beam Path
(4.3.6.3)
None is required if 4.3.1 and 4.3.2 fulfilled
Remote Interlock Con-
nector (4.3.7)
---
---
---
---
S
X
Beam Stop or Attenuator
(4.3.8)
---
---
---
---
S
X
Activation Warning Sys-
tems (4.3.9)
---
---
---
---
S
X
Emission Delay (4.3.9.1)
---
---
---
---
---
X
Indoor Laser Controlled
Area (4.3.10)
---
---
---
---
X
NHZ
X
NHZ
Class 3b Laser Con-
trolled Area (4.3.10.1)
---
---
---
---
X
---
Class 4 Laser Controlled
Area (4.3.10.2)
---
---
---
---
---
X
Laser Outdoor Controls
(4.3.11)
---
---
---
---
X
NHZ
X
NHZ
Laser in Navigable Air-
space (4.3.11.2)
---
---
---
S
S
S
Temporary Laser Con-
trolled Area (4.3.12)
l
MPE
l
MPE
l
MPE
l
MPE
---
---
Remote Firing & Monitor-
ing (4.3.13)
---
---
---
---
---
S
Labels (4.3.14 and 4.7)
X
X
X
X
X
X
Area Posting (4.3.15)
---
---
---
S
X
NHZ
X
NHZ