IEC 62595-2-4:2020

Display lighting unit - Part 2-4: Electro-optical measuring methods of laser module

IEC 62595-2-4:2020

Name:IEC 62595-2-4:2020   Standard name:Display lighting unit - Part 2-4: Electro-optical measuring methods of laser module
Standard number:IEC 62595-2-4:2020   language:English language
Release Date:28-Sep-2020   technical committee:TC 110 - Electronic displays
Drafting committee:WG 19 - TC 110/WG 19   ICS number:01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION

IEC 62595-2-4
Edition 1.0 2020-09
INTERNATIONAL
STANDARD
colour
inside
Display lighting unit –
Part 2-4: Electro-optical measuring methods of laser module




your local IEC member National Committee for further information.

IEC Central Office Tel.: +41 22 919 02 11
3, rue de
CH-1211 Geneva 20
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and
once a month by email. French extracted from the Terms and Definitions clause of
IEC publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or CISPR.

need further assistance, please contact the Customer Service

.
IEC 62595-2-4
Edition 1.0 2020-09
INTERNATIONAL
STANDARD
colour
inside
Display lighting unit –
Part 2-4: Electro-optical measuring methods of laser module

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.120, 31.260 ISBN 978-2-8322-8912-9

– 2 – IEC 62595-2-4:2020 © IEC 2020
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references . 9
3 Terms, definitions, abbreviated terms, and letter symbols . 9
3.1 Terms and definitions . 9
3.2 Abbreviated terms and letter symbols . 11
3.2.1 Abbreviated terms . 11
3.2.2 Letter symbols . 12
4 Standard measuring conditions . 14
4.1 Standard measuring environmental conditions . 14
4.2 Standard measuring dark-room conditions . 14
4.3 Safety requirements . 14
4.4 Standard DUT conditions . 15
4.5 Standard LMD requirements . 15
4.6 Standard measurement setup and coordinate system . 17
5 Measuring methods . 20
5.1 General . 20
5.2 Current-light output characteristics . 21
5.2.1 General . 21
5.2.2 I-P and I- P / P characteristics . 21
o o i
5.2.3 CW and PWM operations . 22
5.2.4 Threshold currents (I ) . 23
th
5.2.5 Measurement procedures . 24
5.3 Spectra (wavelength) and chromaticity measurements . 25
5.3.1 General . 25
5.3.2 Measurement procedures . 25
5.4 FFP . 26
5.4.1 General . 26
5.4.2 Monochromatic FFP . 26
5.4.3 Colorimetric FFP . 27
5.5 Monochromatic speckle and colour speckle . 30
5.5.1 General . 30
5.5.2 Monochromatic speckle measurement affected by FFP . 30
5.5.3 Colour speckle measurement affected by FFP . 32
5.6 Temperature dependence . 35
5.6.1 General . 35
5.6.2 High-power LD module . 35
5.6.3 Low-power RGB LD module . 36
5.7 High-speed pulse modulation properties . 37
5.7.1 General . 37
5.7.2 Optical output pulse waveform measurement . 37
Annex A (informative) Laser devices . 40
A.1 Edge-emitting laser diode . 40
A.2 Single- and multi-transverse modes . 41
A.3 Single- and multi-longitudinal modes . 42

A.4 Vertical cavity surface-emitting laser diode (VCSEL) . 43
A.5 Photon up-conversion laser device. 45
Annex B (informative) Structure of laser module . 46
B.1 Monochromatic laser module . 46
B.2 RGB laser module . 47
B.3 Other output optics . 48
Annex C (informative) Narrow-linewidth emission spectra of laser modules . 49
C.1 Spectra of monochromatic high-power LD modules . 49
C.2 Spectra of multi-colour, single-longitudinal mode LD modules . 51
C.3 Spectra of multi-colour, multi-longitudinal mode LD modules . 51
C.4 Chromaticity measurements using a colorimeter . 52
Annex D (informative) Chromaticity accuracy when measuring narrow spectral
linewidth . 53
D.1 General . 53
D.2 Wavelength accuracy to keep chromaticity accuracy < 0,001 or < 0,005 . 53
D.3 Spectral bandwidth to keep chromaticity accuracy < 0,001 . 55
Annex E (informative) Numerical aperture (NA) of fibre . 58
E.1 Fibre NA and maximum divergence angle . 58
E.2 Colour-dependence of fibre NA . 58
Annex F (informative) Conversion of the spherical and Cartesian coordinate systems . 59
Annex G (informative) Centroid wavelength . 60
Annex H (informative) Examples of colour speckle pattern on colorimetric FFPs of
fibre output . 62
H.1 General . 62
H.2 Measured FFP . 62
Annex I (informative) Temperature dependence of LDs . 65
I.1 Formulation of the thermal performance of LD chips . 65
I.2 Calculated examples of I-P characteristics . 66
o
I.3 Temperature dependence of emitting wavelengths . 69
I.4 Temperature dependence of colour speckle and FFP . 69
Annex J (informative) Eye diagram . 71
J.1 Eye diagram . 71
J.2 Examples of measured eye diagrams . 72
Bibliography . 73

Figure 1 – Measurement setup and coordinate system (spherical) . 18
Figure 2 – Measurement setup and coordinate system (Cartesian) . 19
Figure 3 – Measurement setup and coordinates for speckle-related optical performance . 20
Figure 4 – Example of I-P and I- P / P characteristics . 22
o o i
Figure 5 – Pulse repetition waveforms of PWM drive with respect to duty cycle . 23
Figure 6 – I and I-P characteristics . 24
th o
Figure 7 – Example of measured colorimetric FFP . 29
Figure 8 – Example of conversion of the measured speckle data on the FFP into data
on a uniform pattern . 31
Figure 9 – Example of conversion of measured normalised illuminance data of colour

speckle on the FFP into data on a uniform pattern . 33

– 4 – IEC 62595-2-4:2020 © IEC 2020
Figure 10 – Example of conversion of measured colour speckle chromaticity data on
the FFP into data on a uniform pattern . 33
Figure 11 – Temperature dependence measurement setup for high-power laser

modules . 36
Figure 12 – Temperature dependence measurement setup for low-power laser modules . 37
Figure 13 – Measurement setup for output pulse waveform . 38
Figure 14 – Example of input/output pulse waveforms . 38
Figure A.1 – Schematic structure of narrow-stripe edge-emitting laser diode. 40
Figure A.2 – Schematic structure of wide-stripe edge-emitting laser diode
...

  • Relates Information
  • ISO 8130-9:1992

    ISO 8130-9:1992 - Coating powders
    09-28
  • EN 352-2:2020/FprA1

    EN 352-2:2021/oprA1:2023
    09-28
  • IEC TS 61158-4:1999

    IEC TS 61158-4:1999 - Digital data communications for measurement and control - Fieldbus for use in industrial control systems - Part 4: Data Link protocol specification Released:3/24/1999 Isbn:2831847656
    09-28
  • HD 566 S1:1990

    HD 566 S1:1998
    09-28
  • ISO 5131:1982/Amd 1:1992

    ISO 5131:1982/Amd 1:1992
    09-28
  • EN 60598-2-22:1990

    EN 60598-2-22:1996
    09-27
  • ISO 8504-2:1992

    ISO 8504-2:1992 - Preparation of steel substrates before application of paints and related products -- Surface preparation methods
    09-27
  • EN 12165:2024

    prEN 12165:2022
    09-27
  • IEC TS 61158-6:1999

    IEC TS 61158-6:1999 - Digital data communications for measurement and control - Fieldbus for use in industrial control systems - Part 6: Application Layer protocol specification Released:3/24/1999 Isbn:2831847613
    09-27
  • ISO 4252:1992

    ISO 4252:1992 - Agricultural tractors -- Operator's workplace, access and exit -- Dimensions
    09-27