Over the past few years, a comprehensive rewrite of the American National Standard for Safe Use of Lasers (ANSI Z136.1) has been conducted [American National Standards Institute, Z136.1-2000 American National Standard for Safe Use of Lasers (American National Standards Institute, New York, 2000)]. Important parts of many laser safety evaluations are the determination of the maximum distance at which the laser presents a hazard and the computation of optical density requirements for eye protection. In the ANSI Z136.1-2000 Standard, two approaches for the computation of hazard distance are presented. We specifically address the derivation of these two methodologies including the effects of atmospheric attenuation and optically aided viewing. In addition, these methodologies may be applied to the computation of visual interference distance as described in the ANSI Z136.6-2000 Standard [American National Standards Institute, Z136.6-2000 American National Standard for Use of Lasers Outdoors (American National Standards Institute, New York, 2000)]. This publication represents the third in a series of tutorial articles designed to clarify laser hazard analysis procedures under these ANSI Standards [R. J. Thomas, B. A. Rockwell, W. J. Marshall, R. C. Aldrich, S. A. Zimmerman, and R. J. Rockwell, Jr., J. Laser Appl. 13, 134–140 (2001); 14, 57–66 (2002)].

1.
W. P.
Roach
,
T. E.
Johnson
, and
B. A.
Rockwell
, “
Proposed maximum permissible exposure limits for ultrashort laser pulses
,”
Health Phys.
76
,
349
354
(
1999
).
2.
S. S.
Charshan
and
B. A.
Rockwell
, “
Update on ANSI Z136.1
,”
J. Laser Appl.
11
,
243
247
(
1999
).
3.
J. W.
Ness
,
H.
Zwick
,
B. E.
Stuck
,
D. J.
Lund
,
B. J.
Lund
,
J. W.
Molchany
, and
D. H.
Sliney
, “
Retinal image motion during deliberate fixation: Implications to laser safety for long duration viewing
,”
Health Phys.
78
,
131
142
(
2000
).
4.
International Commission on Non-Ionizing Radiation Protection, “
Revision of Guidelines on Limits of Exposure to Laser Radiation of Wavelengths between 400 nm and 1.4 μm
,”
Health Phys.
79
,
431
440
(
2000
).
5.
C. P.
Cain
,
C. A.
Toth
,
G. D.
Noojin
,
V.
Carothers
,
D. J.
Stolarski
, and
B. A.
Rockwell
, “
Thresholds for visible lesions in the primate eye produced by ultrashort near-infrared laser pulses
,”
Invest. Ophthalmol. Visual Sci.
40
,
2343
2349
(
1999
).
6.
C. P.
Cain
,
C. A.
Toth
,
C. D.
DiCarlo
,
C. D.
Stein
,
G. D.
Noojin
,
D. J.
Stolarski
, and
W. P.
Roach
, “
Visible retinal lesions from ultrashort laser pulses in the primate eye
,”
Invest. Ophthalmol. Visual Sci.
36
,
879
888
(
1995
).
7.
W. J.
Marshall
, “
Understanding laser hazard evaluation
,”
J. Laser Appl.
7
,
99
105
(
1995
).
8.
W. J.
Marshall
, “
Determining hazard distances from non-Gaussian lasers
,”
Appl. Opt.
30
,
696
698
(
1991
).
9.
W. P.
Van De Merwe
and
W. J.
Marshall
, “
Hazardous ranges of laser beams and their reflections from targets
,”
Appl. Opt.
5
,
605
611
(
1985
).
10.
W. J.
Marshall
, “
Laser reflections from relatively flat specular surfaces
,”
Health Phys.
56
,
753
757
(
1989
).
11.
W. J.
Marshall
, “
Hazard analysis on Gaussian shaped laser beams
,”
American Industrial Hygiene Association Journal
,
41
,
547
551
(
1980
).
12.
W. J.
Marshall
and
P. W.
Conner
, “
Field laser hazard calculations
,”
Health Phys.
52
,
27
37
(
1987
).
13.
American National Standards Institute, Z136.1-2000 American National Standard for Safe Use of Lasers (American National Standards Institute, New York, 2000).
14.
American National Standards Institute, Z136.6-2000 American National Standard for Safe Use of Lasers Outdoors (American National Standards Institute, New York, 2000).
15.
Illuminating Engineering Society, Lighting Handbook, 8th ed. (Illuminating Engineering Society of North America, New York, 1993).
16.
R. J.
Thomas
,
B. A.
Rockwell
,
W. J.
Marshall
,
R. C.
Aldrich
,
S. A.
Zimmerman
, and
R. J.
Rockwell
, Jr.
, “
A procedure for multiple pulse MPE determination under the Z136.1-2000 American National Standard for Safe Use of Lasers
,”
J. Laser Appl.
13
,
134
140
(
2001
).
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