SIST EN ISO 13697:2006

SLOVENSKI STANDARD
SIST EN ISO 13697:2006
01-julij-2006
2SWLNDLQIRWRQVNDWHKQRORJLMD/DVHUMLLQODVHUVNDRSUHPD0HWRGH]D
SUHVNXãDQMHRGERMQRVWLLQSUHQRVDNRPSRQHQWRSWLþQLKODVHUMHY,62
Optics and photonics - Lasers and laser-related equipment - Test methods for specular
reflectance and regular transmittance of optical laser components (ISO 13697:2006)
Optik und Photonik - Laser und Laseranlagen - Prüfverfahren für die spekulare Reflexion
und die gerichtete Transmission von optischen Laserkomponenten (ISO 13697:2006)
Optique et photonique - Lasers et équipements associés aux lasers - Méthodes d'essai
du facteur de réflexion spéculaire et du facteur de transmission des composants
optiques laser (ISO 13697:2006)
Ta slovenski standard je istoveten z: EN ISO 13697:2006
ICS:
31.260 Optoelektronika, laserska Optoelectronics. Laser
oprema equipment
SIST EN ISO 13697:2006 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

EUROPEAN STANDARD
EN ISO 13697
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2006
ICS 31.260

English Version
Optics and photonics - Lasers and laser-related equipment -
Test methods for specular reflectance and regular transmittance
of optical laser components (ISO 13697:2006)
Optique et photonique - Lasers et équipements associés Optik und Photonik - Laser und Laseranlagen -
aux lasers - Méthodes d'essai du facteur de réflexion Prüfverfahren für den gerichteten Reflexionsgrad und den
spéculaire et du facteur de transmission des composants Transmissionsgrad von optischen Laserkomponenten (ISO
optiques laser (ISO 13697:2006) 13697:2006)
This European Standard was approved by CEN on 13 April 2006.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Central Secretariat or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,
Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 13697:2006: E
worldwide for CEN national Members.

---------------------- Page: 2 ----------------------

EN ISO 13697:2006 (E)





Foreword


This document (EN ISO 13697:2006) has been prepared by Technical Committee ISO/TC 172
"Optics and optical instruments" in collaboration with Technical Committee CEN/TC 123 "Lasers
and photonics", the secretariat of which is held by DIN.

This European Standard shall be given the status of a national standard, either by publication of
an identical text or by endorsement, at the latest by November 2006, and conflicting national
standards shall be withdrawn at the latest by November 2006.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.


Endorsement notice

The text of ISO 13697:2006 has been approved by CEN as EN ISO 13697:2006 without any
modifications.

2

---------------------- Page: 3 ----------------------

INTERNATIONAL ISO
STANDARD 13697
First edition
2006-05-15

Optics and photonics — Lasers and
laser-related equipment — Test methods
for specular reflectance and regular
transmittance of optical laser
components
Optique et photonique — Lasers et équipements associés aux lasers —
Méthodes d'essai du facteur de réflexion spéculaire et du facteur de
transmission des composants optiques laser




Reference number
ISO 13697:2006(E)
©
ISO 2006

---------------------- Page: 4 ----------------------

ISO 13697:2006(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.


©  ISO 2006
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland

ii © ISO 2006 – All rights reserved

---------------------- Page: 5 ----------------------

ISO 13697:2006(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope .1
2 Normative references .1
3 Terms and definitions .1
4 Symbols used and units of measure .2
5 Test and calibration principles.2
5.1 General.2
5.2 Specular reflectance.2
5.3 Transmittance .3
5.4 Calibration .3
6 Preparation of test sample and measuring arrangement.7
6.1 General.7
6.2 Laser beam preparation .8
6.3 Chopper .8
6.4 Detector arrangement .8
7 Characteristic features of the laser beam .9
8 Test procedure.9
8.1 Calibration of the chopper mirror .9
8.2 Specular reflectance for near-normal incidence .10
8.3 Angular dependence of reflectance.11
8.4 Transmittance .12
9 Evaluation.13
9.1 Specular reflectance for near-normal incidence .13
9.2 Angular dependence of reflectance.13
9.3 Transmittance .13
10 Test report .14
Bibliography .16

© ISO 2006 – All rights reserved iii

---------------------- Page: 6 ----------------------

ISO 13697:2006(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 13697 was prepared by Technical Committee ISO/TC 172, Optics and photonics, Subcommittee SC 9,
Electro-optical systems.
iv © ISO 2006 – All rights reserved

---------------------- Page: 7 ----------------------

ISO 13697:2006(E)
Introduction
Laser-based optical systems require optical components with greatly enhanced reflectance and/or
transmission characteristics. It is necessary to be able to measure these characteristics precisely. The
measurement procedures in this International Standard have been optimized to allow the measurement of the
specular reflectance and transmittance of the optical components to a high degree of accuracy over a wide
range of values.
© ISO 2006 – All rights reserved v

---------------------- Page: 8 ----------------------

INTERNATIONAL STANDARD ISO 13697:2006(E)

Optics and photonics — Lasers and laser-related equipment —
Test methods for specular reflectance and regular
transmittance of optical laser components
1 Scope
This International Standard specifies measurement procedures for the precise determination of the specular
reflectance and regular transmittance of optical laser components. The accuracy of the described test
methods exceeds that of measurement procedures outlined in ISO 15368 by several orders of magnitude.
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.
ISO 31-6, Quantities and units — Part 6: Light and related electromagnetic radiations
ISO 11145, Optics and photonics — Lasers and laser-related equipment — Vocabulary and symbols
ISO 14644-1, Cleanrooms and associated controlled environments — Part 1: Classification of air cleanliness
3 Terms and definitions
For the purpose of this document, the terms and definitions given in ISO 11145 and ISO 31-6 apply.
© ISO 2006 – All rights reserved 1

---------------------- Page: 9 ----------------------

ISO 13697:2006(E)
4 Symbols used and units of measure
Table 1 — Symbols used and units of measure
Symbol Unit Term
ρ specular reflectance of sample
s
ρ , ρ specular reflectance of chopper, specular reflectance of deflecting mirror
ch m
τ regular transmittance of sample
s
λ m wavelength
P W average power
av
β rad angle of incidence
d m beam diameter on the test sample
f Hz chopper frequency
ch
f Hz frequency of laser power modulation
am
P W power of reference beam
r
P W power of probe beam
p
∆P W power difference between reference beam and probe beam
S signal at frequency of laser power modulation
m
S signal at frequency of laser power modulation, probe beam blocked
mo
∆S signal at frequency, which is the sum or the difference of chopper frequency and power
modulation frequency
∆S signal at frequency, which is the sum or the difference of chopper frequency and power
0
modulation frequency, probe beam blocked
C , C arbitrary constants
1 2
5 Test and calibration principles
5.1 General
Specular reflectance and regular transmittance are determined optically as the ratio of the regularly reflected
or regularly transmitted part of the reflected or transmitted power radiation to the incident power radiation.
The reflectance or the transmittance of the test sample are constant within the temperature fluctuations
experienced by the component during the test and are independent of the power density of the impinging
radiation.
5.2 Specular reflectance
The reflectance of optical components is determined optically by means of a measuring arrangement as
shown in Figures 1 and 2.
An optically flat and highly reflective chopper mirror divides the laser beam into a probe beam and a reference
beam. The probe beam is reflected by the chopper mirror and the sample, whereas the reference beam
transmits without being affected. Both beams, alternating temporally, impinge upon the same spot on the rear
target of the integrating sphere.
Figure 1 shows the measuring arrangement for near-normal incidence, whereas the angular dependence of
reflectance can be measured in a measuring arrangement according to Figure 2. Compared with the
arrangement in Figure 1, an additional mirror is used to create a double bounce permitting the measurement
of the reflectance of the sample at different angles of incidence.
2 © ISO 2006 – All rights reserved

---------------------- Page: 10 ----------------------

ISO 13697:2006(E)
The powers P for the probe beam and P for the reference beam are related by
p r
2
 = ρ ρρ  (1)
P P
prs
ch m
where
ρ is the specular reflectance of the additional deflecting mirror;
m
2
ρ is the double bounce on the sample;
s
ρ is the specular reflectance of the sample;
s
ρ is the specular reflectance of the chopper mirror.
ch
The specular reflectance ρ of the test sample can be expressed as
s
⎛⎞
1 ∆P
ρ =  ×− 1 (2)
⎜⎟
s
ρρ
P
⎝⎠r
ch m
where ∆P = P − P
r p
5.3 Transmittance
The transmittance of optical components is determined by means of a measuring arrangement as shown in
Figure 3 using an additional mirror with known reflectance ρ .
m
For the powers P and P measured with a set-up according to Figure 3, the following relationship exists
p r
P = τρ ρ P (3)
p s ch m r
whereτ is the regular transmittance of the sample.
s
The regular transmittance τ of the test sample can be calculated from the following relationship:
s
1 ⎛⎞∆P
 =  ×− 1 (4)
τ
s ⎜⎟
ρρ
P
⎝⎠r
ch m
5.4 Calibration
The reflectance of the chopper mirror has to be known for evaluation. Figure 4 shows the measurement set-up
used for the calibration procedure. To determine the two unknown specular reflectances ρ of the additional
m
mirror and ρ of the chopper mirror, two sets of measurements have to be performed. One measurement is
ch
done in the set-up of the test procedure described in 8.2, while for the other measurement the integrating
sphere and an additional mirror have to be replaced according to Figure 4. The beam transforming optics and
the chopper mirror remain unchanged to ensure that the laser hits the chopper under identical conditions. For
the set-up according to Figure 4, the following relationship for the powers P and P exists
p r
Pp
P
r
 = (5)
ρ ρ
mch
© ISO 2006 – All rights reserved 3

---------------------- Page: 11 ----------------------

ISO 13697:2006(E)
This set-up enables the computation of the quotient Q of the specular reflectance of the additional mirror and
the chopper mirror.
ρ
m
Q = (6)
ρ
ch
Their product P is determined according to Figure 1, where the sample is replaced by the additional mirror. In
this case:
P=×ρ ρ (7)
mch
The specular reflectance of the chopper ρ and the additional mirror ρ are given by
ch m
P
ρ = (8)
ch
Q
ρ=×PQ (9)
m

Key
1 laser 6 probe beam
2 telescope 7 reference beam
3 pinhole 8 integrating sphere
4 chopper 9 detector, mounted on top of the sphere
5 sample 10 rotating target
Figure 1 — Schematic measuring arrangement for specular reflectance measurement
(near-normal incidence angle on sample)
4 © ISO 2006 – All rights reserved

---------------------- Page: 12 ----------------------

ISO 13697:2006(E)

Key
1 laser 7 reference beam
2 telescope 8 integrating sphere
3 pinhole 9 detector, mounted on top of the sphere
4 chopper 10 rotating target
5 sample 11 additional mirror
6
...