1、October 2011 Translation by DIN-Sprachendienst.English price group 11No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).IC
2、S 81.040.10!$ttk“1818172www.din.deDDIN ISO 12123Optics and photonics Specification of raw optical glass (ISO 12123:2010)English translation of DIN ISO 12123:2011-10Optik und Photonik Spezifikation von optischem Rohglas (ISO 12123:2010)Englische bersetzung von DIN ISO 12123:2011-10Optique et photoniq
3、ue Spcification dun verre doptique brut (ISO 12123:2010)Traduction anglaise de DIN ISO 12123:2011-10www.beuth.deDocument comprises pagesIn case of doubt, the German-language original shall be considered authoritative.1909.11 A comma is used as the decimal marker. Contents Page National foreword .3 N
4、ational Annex NA (informative) Bibliography.3 1 Scope 5 2 Normative references 5 3 Terms and definitions5 4 Tolerances 8 4.1 Principal refractive index 8 4.2 Refractive index variation .8 4.3 Abbe number8 4.4 Spectral internal transmittance 8 4.5 UV cut-off edge and colour code .9 4.5.1 General9 4.5
5、.2 UV cut-off edge 9 4.5.3 Colour code 9 4.6 Optical homogeneity .9 4.7 Striae .10 4.8 Bubbles and inclusions.10 4.9 Stress birefringence 11 5 Indications for ordering raw glass parts .12 Annex A (informative) Recommendation for the specification of raw optical glass for a given optical element spec
6、ification 13 A.1 General13 A.2 Refractive index variation .13 A.3 Optical homogeneity .14 A.4 Striae .15 A.5 Bubbles and inclusions.16 A.6 Stress birefringence 17 Bibliography 19 2 DIN ISO 12123:2011-10 National foreword This standard has been prepared by Technical Committee ISO/TC 172 “Optics and p
7、hotonics”, Subcommittee SC 3 “Optical materials and components” (Secretariat: JISC, Japan). The responsible German body involved in its preparation was the Normenausschuss Feinmechanik und Optik (Optics and Precision Mechanics Standards Committee), Working Committee NA 027-01-05 AA Optische Werkstof
8、fe. The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 7944 DIN EN ISO 7944 ISO 10110 (all parts) DIN ISO 10110 (all parts) National Annex NA (informative) Bibliography DIN EN ISO 7944, Optics and optical instruments Reference wavelengths
9、DIN ISO 10110-1, Optics and photonics Preparation of drawings for optical elements and systems Part 1: General DIN ISO 10110-2, Optics and optical instruments Preparation of drawings for optical elements and systems Part 2: Material imperfections Stress birefringence DIN ISO 10110-3, Optics and opti
10、cal instruments Preparation of drawings for optical elements and systems Part 3: Material imperfections Bubbles and inclusions DIN ISO 10110-4, Optics and optical instruments Preparation of drawings for optical elements and systems Part 4: Material imperfections Inhomogenity and striae DIN ISO 10110
11、-5, Optics and photonics Preparation of drawings for optical elements and systems Part 5: Surface form tolerances DIN ISO 10110-5 Supplement 1, Optics and optical instruments Preparation of drawings for optical elements and systems Part 5: Surface form tolerances Surface form tolerance inspection us
12、ing testing glasses DIN ISO 10110-6, Optics and optical instruments Preparation of drawings for optical elements and systems Part 6: Centring tolerances DIN ISO 10110-7, Optics and photonics Preparation of drawings for optical elements and systems Part 7: Surface imperfection tolerances DIN ISO 1011
13、0-8, Optics and optical instruments Preparation of drawings for optical elements and systems Part 8: Surface texture DIN ISO 10110-9, Optics and optical instruments Preparation of drawings for optical elements and systems Part 9: Surface treatment and coating 3 DIN ISO 12123:2011-10 DIN ISO 10110-10
14、, Optics and photonics Preparation of drawings for optical elements and systems Part 10: Table representing data of optical elements and cemented assemblies DIN ISO 10110-11, Optics and optical instruments Preparation of drawings for optical elements and systems Part 11: Non-toleranced data DIN ISO
15、10110-12, Optics and photonics Preparation of drawings for optical elements and systems Part 12: Aspheric surfaces DIN ISO 10110-14, Optics and photonics Preparation of drawings for optical elements and systems Part 14: Wavefront deformation tolerance DIN ISO 10110-17, Optics and photonics Preparati
16、on of drawings for optical elements and systems Part 17: Laser irradiation damage threshold DIN ISO 10110 Supplement 1, Optics and optical instruments Preparation of drawings for optical elements and systems Comparison DIN ISO 10110 DIN 3140 Index DIN Taschenbuch (DIN Handbook) 304, Technische Produ
17、ktdokumentation Erstellung von Zeichnungen fr optische Systeme und Elemente 4 DIN ISO 12123:2011-10 Optics and photonics Specification of raw optical glass 1 Scope This International Standard gives rules for the specification of raw optical glass. It serves as a complement to ISO 10110, which provid
18、es rules specifying finished optical elements. Since raw optical glass may be quite different in shape and size from the optical elements, its specification also differs from that of optical elements. This International Standard provides guidelines for the essential specification characteristics of
19、raw optical glass in order to improve communication between glass suppliers and optical element manufacturers. For specific applications (e.g. lasers, the infrared spectral range), specifications based on this International Standard will have to be supplemented. NOTE Additional information on how to
20、 translate optical element specifications into raw optical glass specifications is given in Annex A. 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 lat
21、est edition of the referenced document (including any amendments) applies. ISO 7944, Optics and optical instruments Reference wavelengths ISO 9802, Raw optical glass Vocabulary ISO 10110 (all parts), Optics and photonics Preparation of drawings for optical elements and systems ISO 11455, Raw optical
22、 glass Determination of birefringence 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 9802 and the following apply. 3.1 refractive index n ratio of the velocity of the electromagnetic waves at a specific wavelength in a vacuum to the velocity of the
23、waves in the medium See ISO 7944. NOTE For practical reasons, this document refers to the refractive index in air. 3.2 principal refractive index refractive index in the middle range of the visible spectrum commonly used to characterize an optical glass NOTE 1 This principal refractive index is usua
24、lly denoted as nd, the refractive index at the wavelength 587,56 nm, or ne, the refractive index at the wavelength 546,07 nm. 5 DIN ISO 12123:2011-10 NOTE 2 The specific values for different glass types refer to standard environmental conditions (20 C and 1 013 hPa according to ISO 11). For common d
25、aily business other reference temperatures are acceptable and will have to be quoted on demand. 3.3 refractive index variation maximum difference of refractive index between samples of optical glasses 3.4 dispersion measure of the change of the refractive index with wavelength 3.5 Abbe number most c
26、ommon characterization of the dispersion of optical glasses EXAMPLE 1 The Abbe number for the d-line is defined as ()()ddFC1nvnn=where nFis the refractive index at wavelength 486,13 nm; nCis the refractive index at wavelength 656,27 nm. EXAMPLE 2 The Abbe number for the e-line is defined as ()()eeFC
27、1nvnn=where nFis the refractive index at wavelength 479,99 nm; nCis the refractive index at wavelength 643,85 nm. 3.6 glass type usually a letter/number designation used in the manufacturers catalogue to designate or characterize the glasses offered NOTE 1 The letter/number designation is the manufa
28、cturers option and is usually a proprietary trade name, and therefore indeterminate. For example, borosilicate crown glass is designated N-BK by one manufacturer, but S-BSL and BSC by others. NOTE 2 An alternative way to specify the glass type is the six-figure number called glass code, for N-BK7 e.
29、g. 517642. It refers to the optical position of the individual glass types. The first three digits refer to the refractive index nd, the second three digits to the Abbe number d. This glass code, however, does not denominate a glass type unequivocally. The same glass code may be valid for glass type
30、s of very different chemical compositions and hence other properties may differ also very significantly. 3.7 transmittance ratio of the transmitted luminous flux to the incident luminous flux of a collimated, monochromatic beam that passes, at normal incidence, through a plane parallel polished plat
31、e 6 DIN ISO 12123:2011-10 3.8 spectral transmittance measure of the variation of the transmittance with wavelength 3.9 spectral internal transmittance ratio of the transmitted luminous flux to the incident luminous flux excluding reflection losses at the surfaces 3.10 UV cut-off edge UVC 80/10 term
32、describing the position and the slope of the transmittance cut-off edge in the short wavelength range and given by the wavelengths at 80 % and 10 % internal transmittance 3.11 colour code CC position and slope of the transmittance cut-off edge in the short wavelength range, given by the wavelengths
33、at 80 % and 5 % transmittance including reflection losses 3.12 optical homogeneity measure of the refractive index variation within a single piece of optical glass given by the difference between the maximum and minimum values of the refractive index within the optical glass 3.13 striae short range
34、deviations of refractive index in glass, resembling bands in which the refractive index fluctuates with a typical period of fractions of one millimetre to several millimetres 3.14 inclusion term covering all localized bulk material imperfections including, but not limited to, bubbles, striae knots,
35、small stones, sand and crystals 3.15 bubble gaseous void in the bulk optical material, of generally circular cross section NOTE Bubbles and solid inclusions are treated the same in assessing the quality of optical glass. 3.16 stress birefringence birefringence caused by residual stresses within the
36、glass, generally as a result of different cooling histories of different partial volumes of a given piece of glass during the forming and/or annealing process, and producing an optical path difference between the ordinary and extraordinary rays for plane polarized light passing through the glass NOT
37、E The optical path difference is proportional to the magnitude of mechanical stress. 7 DIN ISO 12123:2011-10 4 Tolerances 4.1 Principal refractive index The preferred tolerance ranges for the principal refractive index are given in Table 1. Table 1 Tolerances for principal refractive index Principal
38、 refractive index tolerance limits 0,002 0 0,001 0 0,000 5 0,000 3 0,000 2 4.2 Refractive index variation Fine annealed raw glasses will be arranged in delivery lots based on the refractive index variation. Therefore, the refractive index variation shall also be specified. All parts of a delivery lo
39、t shall meet the tolerances for refractive index given in Table 2. Table 2 Tolerances for refractive index variation within a delivery lot Refractive index variation tolerance limits 30 10510 1055 1052 1054.3 Abbe number The tolerances for the Abbe number are given in Table 3. Table 3 Tolerances for
40、 Abbe number Abbe number tolerance limits 0,8 % 0,5 % 0,3 % 0,2 % 4.4 Spectral internal transmittance Spectral internal transmittance data shall be reported for thicknesses of 10 mm, and optionally 5 mm or 25 mm thicknesses. The reference thickness shall be listed in the manufacturers catalogue or d
41、ata sheet. The data shall be the typical spectral internal transmittance for a given glass type. It may be the median value of several different melts. If the buyers requirement for melt data or minimum values for spectral internal transmittance are critical, the requirement shall be specified on th
42、e drawing or in the purchase order. 8 DIN ISO 12123:2011-10 4.5 UV cut-off edge and colour code 4.5.1 General For the description of the UV transmittance cut-off edge the so-called colour code is used. Its advantage is that it may be measured easily and cost-effectively. On the other hand, especiall
43、y high index glass types hardly reach the 80 % transmittance level because of their high reflection losses. Therefore, their quality is not described very distinctly and adequately to their application as coated elements in any case. The 5 % limit may lead to ambiguous results with glass types showi
44、ng fluorescence in the UV-region. Such problems may be avoided by use of the UV cut-off edge UVC 80/10. 4.5.2 UV cut-off edge The UV cut-off edge lists the wavelengths 80and 10, in which the internal transmittance (excluding reflection losses) is 0,80 and 0,10 at 10 mm thickness. The reflection loss
45、es may be calculated using catalogue refractive index data. A UVC 80/10 measurement result, for example, may be quoted as 332/303 indicating the internal transmittances of 80 % at 80= 332 nm and of 10 % at 10= 303 nm. 4.5.3 Colour code The colour code lists the wavelengths 80and 5, at which the tran
46、smittance (including reflection losses) is 0,80 and 0,05 at 10 mm thickness. The values are rounded to 10 nm and are written by eliminating the last digit. For example, colour code 33/30 indicates 80= 330 nm and 5= 300 nm. 4.6 Optical homogeneity The refractive index homogeneity that is achievable f
47、rom a given glass type depends on the volume and the form of the individual glass pieces. Therefore, if it is necessary to specify the optical homogeneity of the raw glass, then this should be done with respect to the final dimensions of the optical elements to be manufactured out of the raw glass p
48、arts. In general the optical homogeneity values specified are peak-to-valley values and contain all aberrations. In many cases it is acceptable to subtract certain aberration terms that are of no importance or can easily be corrected (e.g. focal terms). This should be specified in advance. Table 4 g
49、ives the preferred homogeneity tolerances. Lower homogeneity grades are already covered by the variation tolerances. Table 4 Tolerances for the homogeneity of optical raw glass Homogeneity tolerance limits (peak-to-valley) Generally applicable for 100 10640 106common application sizes 10 1064 106partial volumes of the raw glass 2 1061 106partial volumes of the raw glass but not for all glass types 9 DIN ISO 12123:2011-10 4
