IEC TR 60825-13:2011

IEC/TR 60825-13 ®
Edition 2.0 2011-10
TECHNICAL
REPORT
colour
inside
Safety of laser products –
Part 13: Measurements for classification of laser products

IEC/TR 60825-13:2011(E)
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IEC/TR 60825-13 ®
Edition 2.0 2011-10
TECHNICAL
REPORT
colour
inside
Safety of laser products –
Part 13: Measurements for classification of laser products

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
XB
ICS 31.260 ISBN 978-2-88912-741-2

– 2 – TR 60825-13  IEC:2011(E)
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Applicability . 8
4.1 General . 8
4.2 Initial considerations . 8
5 Instrumentation requirements . 9
6 Classification flow. 10
7 Parameters for calculation of accessible emission limits . 12
7.1 Wavelength (λ) . 12
7.1.1 Wavelength determination . 12
7.1.2 Ocular hazard regions . 14
7.2 Multiple wavelength sources . 14
7.2.1 General . 14
7.2.2 Single hazard region . 15
7.2.3 Two or more hazard regions . 15
7.3 Spectrally broad sources . 15
7.3.1 General . 15
7.3.2 Spectral regions with small variation of the AEL with wavelength . 15
7.3.3 Spectral regions with large variation of the AEL with wavelength
(302,5 nm - 315 nm, 450 nm – 600 nm and 1 150 nm – 1 200 nm) . 16
7.3.4 Spectral regions containing hazard-type boundaries (near 400 nm
and 1 400 nm) . 16
7.3.5 Very broad sources . 16
7.4 Source temporal characteristics . 17
7.4.1 General . 17
7.4.2 Sources with limited “ON” time . 17
7.4.3 Periodic or constant duty factor sources . 17
7.4.4 Sources with amplitude variation . 19
7.4.5 Sources with varying pulse durations or irregular pulses . 20
7.5 Angular subtense (α) . 20
7.5.1 General . 20
7.5.2 Location of the reference point . 22
7.5.3 Methods for determining angular subtense (α) . 23
7.5.4 Multiple sources and simple non-circular beams . 26
7.6 Emission duration . 31
7.6.1 General . 31
7.6.2 Pulse duration . 31
7.6.3 Pulse repetition frequency . 31
7.7 Measurement conditions . 31
7.7.1 General . 31
7.7.2 Measurement conditions for classification . 31
7.7.3 Measurement conditions for hazard evaluation . 33
7.8 Scanning beams . 36
7.8.1 General . 36

TR 60825-13  IEC:2011(E) – 3 –
7.8.2 Stationary angular subtense (α ) . 36
s
7.8.3 Scanned pulse duration (T ) . 37
p
7.8.4 Scanning angular subtense (α ) . 38
scan
7.8.5 Bi-directional scanning . 39
7.8.6 Number of scan lines in aperture (n) . 39
7.8.7 Maximum hazard location . 40
7.8.8 Gaussian beam coupling parameter (η) . 41
7.8.9 Scan angle multiplication factor . 41
Annex A (informative) Examples . 43
Annex B (informative) Useful conversions . 64
Bibliography . 65

Figure 1 – Continuous wave laser classification flow . 11
Figure 2 – Pulsed laser classification flow . 12
Figure 3 – Important wavelengths and wavelength ranges . 13
Figure 4 – Pulse duration definition . 18
Figure 5 – Flat-topped and irregular pulses . 20
Figure 6 – Angular subtense . 21
Figure 7 – Location of beam waist for a Gaussian beam . 23
Figure 8a – Measurement set-up with source imaging . 24
Figure 8b – Measurement set-up for accessible source . 26
Figure 8 – Apparent source measurement set-ups . 26
Figure 9 – Linear array apparent source size . 27
Figure 10 – Measurement geometries . 29
Figure 11 – Effective angular subtense of a simple non-circular source . 30
Figure 12 – Imaging a stationary apparent source located beyond the scanning beam
vertex . 37
Figure 13 – Imaging a scanning apparent source located beyond the scanning beam
vertex . 37
Figure 14 – Scanning mirror with an arbitrary scan angle multiplication factor . 42
Figure A.1 – Multiple raster lines crossing the measurement aperture at distance from
scanning vertex where C = 1 . 49
Table 1 – Reference points . 22
Table 2 – Four source array . 28
Table A.1 – Number of source cases . 62
Table A.2 – Number of source cases . 63

– 4 – TR 60825-13  IEC:2011(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
SAFETY OF LASER PRODUCTS –
Part 13: Measurements for classification of laser products

FOREWORD
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