IEC TR 60825-13:2006

TECHNICAL IEC
REPORT TR 60825-13
First edition
2006-08
Safety of laser products –
Part 13:
Measurements for classification
of laser products
Reference number
IEC/TR 60825-13:2006(E)
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TECHNICAL IEC
REPORT TR 60825-13
First edition
2006-08
Safety of laser products –
Part 13:
Measurements for classification
of laser products
 IEC 2006  Copyright - all rights reserved
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– 2 – TR 60825-13  IEC:2006(E)
CONTENTS
FOREWORD.3

1 Scope.5
2 Normative references .5
3 Terms and definitions .5
4 Applicability.7
4.1 General .7
4.2 Initial considerations .7
5 Instrumentation requirements .8
6 Classification flow.8
7 Parameters for calculation of accessible emission limits .12
7.1 Wavelength (λ).12
7.2 Multiple wavelength sources.13
7.3 Spectrally broad sources .14
7.4 Source temporal behaviour.16
7.5 Angular subtense (α).18
7.6 Emission duration.26
7.7 Measurement conditions.26
7.8 Scanning beams.27

Annex A (informative) Large source classification example .32

Bibliography.37

Figure 1 – Continuous wave laser classification flow.10
Figure 2 – Pulsed laser classification flow.11
Figure 3 – Important wavelengths and wavelength ranges .12
Figure 4 – Pulse duration definition.17
Figure 5 – Flat-topped and irregular pulses.18
Figure 6 – Examples of angular subtense .19
Figure 7 – Location of beam waist for a Gaussian beam .20
Figure 8 – Source measurement geometries .24
Figure 9 – Linear array apparent source size .25
Figure 10 – Effective angular subtense of a simple non-circular source .26
Figure 11 – Imaging a stationary apparent source located beyond the scanning beam
vertex .28
Figure 12 – Imaging a scanning apparent source located beyond the scanning beam
vertex .28

Table 1 – Reference points .20
Table 2 – Four source array.23

TR 60825-13  IEC:2006(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
SAFETY OF LASER PRODUCTS –
Part 13: Measurements for classification of laser products

FOREWORD
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The main task of IEC technical committees is to prepare International Standards. However, a
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data of a different kind from that which is normally published as an International Standard, for
example "state of the art".
IEC 60825-13, which is a technical report, has been prepared by IEC technical committee 76:
Optical radiation safety and laser equipment.
The text of this technical report is based on the following documents:
Enquiry draft Report on voting
76/332/DTR 76/345/RVC
Full information on the voting for the approval of this technical report can be found in the
report on voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

– 4 – TR 60825-13  IEC:2006(E)
This technical report is to be used in conjunction with IEC 60825-1:1993 and its Amendment 1
(1997) and Amendment 2 (2001), referred to in this report as “the standard”.
A list of all parts of the IEC 60825 series, published under the general title Safety of laser
products, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

TR 60825-13  IEC:2006(E) – 5 –
SAFETY OF LASER PRODUCTS –
Part 13: Measurements for classification of laser products

1 Scope
This part of IEC 60825 provides manufacturers, test houses, safety personnel, and others
with practical guidance on methods to perform radiometric measurements or analyses to
establish the emission level of laser energy in accordance with IEC 60825-1 (herein referred
to as “the standard”). The measurement procedures described in this technical report are
intended as guidance for classification of laser products in accordance with, that standard.
Other procedures are acceptable if they are better or more appropriate.
Information is provided for calculating accessible emission limits (AELs) and maximum
permissible exposures (MPEs), since some parameters used in calculating the limits are
dependent upon other measured quantities.
This document is intended to apply to lasers, including extended sources and laser arrays.
Users of this document should be aware that the procedures described herein for extended
source viewing conditions may yield more conservative results than when using more rigorous
methods.
NOTE Work continues on more complex source evaluations and will be provided as international agreement on
the methods is reached.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 60825-1:1993, Safety of laser products – Part 1: Equipment classification, requirements
1)
and user’s guide
Amendment 1 (1997)
Amendment 2 (2001)
IEC 61040, Power and energy measuring detectors, instruments and equipment for laser
radiation
ISO 11554, Optics and optical instruments – Lasers and laser-related equipment – Test
methods for laser beam power, energy and temporal characteristics
3 Terms and definitions
For the purposes of this document, the terms and definitions contained in IEC 60825-1 as well
as the following apply.
3.1
angular velocity
speed of a scanning beam in radians per second
___________
1)
There exists a consolidated edition (1.2) of IEC 60825-1 (1993), including its Amendment 1 (1997) and
Amendment 2 (2001).
– 6 – TR 60825-13  IEC:2006(E)
3.2
beam profile
the ir
...