ISO INTERNATIONAL 12123 STANDARD Third edition 2018-12 Optics and photonics Specification of raw optical glass Optique et photonique - Spécification d'un verre d'optique brut Reference number IS0 12123:2018(E) ISO 4 @ IS0 2018 IS0 12123:2018(E) COPYRIGHT PROTECTED DOCUMENT IS0 2018 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 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland i @ IS0 2018 - All rights reserved IS0 12123:2018(E) Contents Page Foreword ..iv Introduction, ..vi 1 Scope. .1 2 Normative references 3 Terms and definitions 1 4 Tolerances .4 4.1 Principal refractive index 4 4.2 Refractive index variation. .5 4.3 Abbe number 5 4.4 Spectral internal transmittance 5 4.5 UV cut-off edge and colour code 6 4.5.1 General. .6 4.5.2 UV cut-off edge .6 4.5.3 Colour code .. 6 4.6 Optical homogeneity .6 4.7 Striae. 7 4.8 Bubbles and inclusions 7 4.9 Stress birefringence. .8 5 Deviation of the relative partial dispersion from the normal line - Definition of the .8 normal lines. Indications for ordering raw glass parts 6 ..10 Annex A (informative) Recommendation for the specification of raw optical glass for a .13 given optical element specification Bibliography ..21 iii @ IS0 2018 - All rights reserved