1、BRITISH STANDARD BS EN ISO 11146-2:2005 Lasers and laser-related equipment Test methods for laser beam widths, divergence angles and beam propagation ratios Part 2: General astigmatic beams The European Standard EN ISO 11146-2:2005 has the status of a British Standard ICS 31.260 BS EN ISO 11146-2:20
2、05 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 March 2005 BSI 30 March 2005 ISBN 0 580 45614 5 National foreword This British Standard is the official English language version of EN ISO 11146-2:2005. It is identical with ISO 11146-2:20
3、05. It partially supersedes BS EN ISO 11146:2000 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee CPW/172, Optics and optical instruments, which has the responsibility to: A list of organizations represented on this committee can be obtained on request
4、 to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Elec
5、tronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to
6、understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document com
7、prises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii to v, a blank page, pages 1 to 15 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publ
8、ication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM ENISO111462 February2005 ICS31.260 Englishversion LasersandlaserrelatedequipmentTestmethodsforlaser beamwidths,divergenceanglesandbeampropagationratios Part2:Generalastigmaticbeams(ISO111462:2005) Lasersetquipementsassocisa
9、uxlasersMthodes dessaideslargeursdufaisceau,anglesdedivergenceet facteursdelimitedediffractionPartie2:Faisceaux astigmatiquesgnraux(ISO111462:2005) LaserundLaseranlagenPrfverfahrenfr Laserstrahlabmessungen,Divergenzwinkelund BeugungsmazahlenTeil2:Allgemeinastigmatische Strahlen(ISO111462:2005) ThisE
10、uropeanStandardwasapprovedbyCENon3February2005. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobt
11、ainedonapplicationtotheCentralSecretariatortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCentralSecretariathasthesamestatusast heofficial versio
12、ns. CENmembersarethenationalstandardsbodiesofAustria,Belgium,Cyprus,CzechRepublic,Denmark,Estonia,Finland,France, Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal, Slovakia, Slovenia,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCO
13、MMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2005CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.ENISO111462:2005:E I NESO 11-641:2002( 5E) 2 Foreword This document (E
14、N ISO 11146-2:2005) has been prepared by Technical Committee ISO/TC 172 “Optics and optical instruments“ in collaboration with Technical Committee CEN/TC 123 “Lasers and laser-related equipment“, the secretariat of which is held by DIN. This European Standard shall be given the status of a national
15、standard, either by publication of an identical text or by endorsement, at the latest by August 2005, and conflicting national standards shall be withdrawn at the latest by August 2005. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries
16、 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, Slovakia, Slovenia, Spain, Sweden, Switzerland
17、and United Kingdom. Endorsement notice The text of ISO 11146-2:2005 has been approved by CEN as EN ISO 11146-2:2005 without any modifications. ENISO111462:2005 Reference number ISO 11146-2:2005(E) OSI 5002INTERNATIONAL STANDARD ISO 11146-2 First edition 2005-02-15 Lasers and laser-related equipment
18、Test methods for laser beam widths, divergence angles and beam propagation ratios Part 2: General astigmatic beams Lasers et quipements associs aux lasers Mthodes dessai des largeurs du faisceau, angles de divergence et des facteurs de limite de diffraction Partie 2: Faisceaux astigmatiques gnraux E
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22、 ta the serddaig sleb nevwo. ISO 5002 All irthgs erse.devr lnUeto sswrehise specified, on trap fo this lbupictaion maeb y cudorperro de tuilizi den yna form ro na ybm ynae,s lecetrinoc ro mecinahcal, inclidung tohpcoiypodna gn micrfoilm, wittuoh repmissii non writign from ietI rehSa Ot tsserdda eh e
23、bolw or ISOs memreb i ydobn the cnuotrfo y ttseuqer ehe.r ISO cirypothg fofice saCe tsopale 65 eneG 1121-HC 02 av leT. 4 + 10 947 22 1 11 xaF0 947 22 14 + 9 74 E-mail coirypthgiso.o gr We bwww.is.o gro Pulbisdehi n Switlrez dnaii ISO 5002 Allr ithgsr esedevrENISO111462:2005IS-64111 O2:(5002E) I SO 5
24、002 All irthgs ersedevr iiiContents Page Foreword iv Introduction.v 1 Scope1 2 Normative references1 3 Terms and definitions .1 4 Coordinate system 5 5 Test principles .5 5.1 General .5 5.2 Spatial second order moments of the Wigner distribution.5 5.3 Second order moments of the Wigner distribution
25、.5 5.4 Derived quantities .5 6 Measurement arrangement and test equipment 6 6.1 General .6 6.2 Preparation.6 6.3 Control of environment.6 6.4 Detector system.6 6.5 Beam-forming optics and optical attenuators7 7 Measurement of the second order moments .7 7.1 General .7 7.2 Measurement of the second o
26、rder moments of power density distributions.7 7.3 Measurement of all second order moments of the Wigner distribution9 8 Determination of effective beam propagation ratio.11 9 Determination of intrinsic astigmatism.11 10 Determination of the twist parameter12 11 Test report12 Bibliography15 ENISO1114
27、62:2005IS-64111 O2:(5002E) iv I SO 5002 All irthgs ersedevrForeword 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 committ
28、ees. 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 Int
29、ernational 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
30、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. ISO 11146-2 was prepared by Technical Committee ISO/TC 172, Optics and photonics, Subcommitte
31、e SC 9, Electro-optical systems. ISO 11146 consists of the following parts, under the general title Lasers and laser-related equipment Test methods for laser beam widths, divergence angles and beam propagation ratios: Part 1: Stigmatic and simple astigmatic beams Part 2: General astigmatic beams Par
32、t 3: Intrinsic and geometrical laser beam classification, propagation, and details of test methods (Technical Report) ENISO111462:2005IS-64111 O2:(5002E) I SO 5002 All irthgs ersedevr vIntroduction The propagation properties of laser beams can be characterized by ten independent parameters when appl
33、ying the method of second order moments (see ISO/TR 11146-3). Most laser beams need few parameters for a complete description due to their higher symmetry. Lasers emit beams which are stigmatic or simple astigmatic due to their resonator design. Part 1 of ISO 11146 describes the measurement methods
34、for stigmatic and simple astigmatic beams while this part of ISO 11146 deals with the measurement procedures for general astigmatic beams. This part of ISO 11146 is applicable to beams of unknown type. Beam characterization, based on the method of second order moments as described in Part 1 and this
35、 part of ISO 11146, is only valid within the paraxial approximation. The theoretical description of beam characterization and propagation as well as the classification of laser beams is given in ISO/TR 11146-3, which is an informative Technical Report. The procedures for background subtraction and o
36、ffset correction are also given in ISO/TR 11146-3. In ISO 11146, the second order moments of the power (energy) density distribution function are used for the determination of beam widths. If problems are experienced in the direct measurements of these quantities, other indirect methods of measureme
37、nt of second order moments may be used as long as comparable results are achievable. In ISO/TR 11146-3, three alternative methods for beam width measurement and their correlation with the method used in this part of ISO 11146 are described. These methods are: variable aperture method; moving knife-e
38、dge method; moving slit method. The problem of the dependence of the measuring result on the truncation limits of the integration area was investigated and evaluated by an international interlaboratory experiment carried out in 1997. The results of this interlaboratory testing were taken into consid
39、eration in this document. The International Organization for Standardization (ISO) draws attention to the fact that it is claimed that compliance with this document may involve the use of a patent concerning the determination of beam characteristics by measuring along the beam caustic of the transfo
40、rmed beam produced by a lens as described in 5.3 and 5.4. ISO takes no position concerning the evidence, validity and scope of this patent right. The holder of this patent right (U.S. No. 5,267,012) has assured ISO that he is willing to negotiate licences under reasonable and non-discriminatory term
41、s and conditions with applicants throughout the world. In this respect, the statement of the holder of this patent right is registered with the ISO. Information may be obtained from: Coherent Inc. 5100 Patrick Henry Drive Santa Clara, CA 95056-0980 USA Attention is drawn to the possibility that some
42、 of the elements of this document may be the subject of patent rights other than those identified above. ISO shall not be held responsible for identifying any or all such patent rights. ENISO111462:2005ENISO111462:2005INTENRATIONAL TSANDADR IS-64111 O2:(5002E)I SO 5002 All irthgs ersedevr 1Lasers an
43、d laser-related equipment Test methods for laser beam widths, divergence angles and beam propagation ratios Part 2: General astigmatic beams 1 Scope This part of ISO 11146 specifies methods for measuring beam widths (diameter), divergence angles and beam propagation ratios of laser beams. This part
44、of ISO 11146 is applicable to general astigmatic beams or unknown types of beams. For stigmatic and simple astigmatic beams, ISO 11146-1 is applicable. Within this part of ISO 11146, the description of laser beams is accomplished by means of the second order moments of the Wigner distribution rather
45、 than physical quantities such as beam widths and divergence angles. However these physical quantities are closely related to the second order moments of the Wigner distribution. In ISO/TR 11146-3, formulae are given to calculate all relevant physical quantities from the measured second order moment
46、s. 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 11145, Optics and o
47、ptical instruments Lasers and laser-related equipment Vocabulary and symbols ISO 11146-1:2005, Lasers and laser-related equipment Test methods for laser beam widths, divergence angles and beam propagation ratios Part 1: Stigmatic and simple astigmatic beams IEC 61040:1990, Power and energy measuring
48、 detectors, instruments and equipment for laser radiation 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 11145, ISO 11146-1, IEC 61040 and the following apply. NOTE The x, y and z-axes in the following definitions refer to the laboratory system (as described in Clause 4). Here and throughout this document the term “power density distribution” refers to continuous wave sources. It might be replaced
