ISO INTERNATIONAL STANDARD 13694 Third edition 2018-11 Optics and photonics Lasers and laser-related equipment Test methods for laser beam power (energy) density distribution Optiqueetphotonique-Lasers etéquipements associésaux lasersMethodes d'essaide distributiondela densitedepuissance (d'energie) du faisceau laser Reference number IS0 13694:2018(E) ISO @ IS0 2018 IS013694:2018(E) COPYRIGHTPROTECTEDDOCUMENT IS02018 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address below or IsO's member body in the country of the requester: ISO copyright office CP 40i : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122.749 0111 Fax: +41 22 749 09 47 Email:[email protected] Website: www.iso.org Published in Switzerland ii IS02018-Allrights reserved IS013694:2018(E) Contents Page Foreword iv Introduction. V 1 Scope. .1 2 Normativereferences .1 3 Terms and definitions .1 3.1 Measured quantities 1 3.2 Characterizing parameters. 3 4 Coordinate system .7 5 Characterizing parameters derived from the measured spatial distribution .7 6 Test principle .7 7 Measurement arrangement and test equipment .8 7.1 General 8 7.2 Preparation 8 7.3 Control of environment 8 7.4 Detectorsystem. 8 7.5 Beam-forming optics, optical attenuators, and beam splitters 9 Test procedure. 9 8 8.1 Equipment preparation 9 8.2 Detectorcalibrationprocedure 10 8.2.1 Spatial calibration. .10 8.2.2 Power (energy) calibration 10 8.3 Data recording and noise correction 10 8.3.1 .10 General. 8.3.2 Correction by background-map subtraction .11 8.3.3 Correctionbyaveragebackground subtraction .11 9 Evaluation .12 10 Test report. .12 Annex A (informative) Testreport .13 Bibliography .16 @ IS0 2018 - All rights reserved iii