Optical Filter Glass - Schott AG ceramics. With more than 130 years of outstanding development,...

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Transcript of Optical Filter Glass - Schott AG ceramics. With more than 130 years of outstanding development,...

  • Optical Filter Glass 2020

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    Advanced Optics SCHOTT North America, Inc. 400 York Avenue

    Duryea, PA 18642

    USA

    Phone +1 570/457-7485

    info.optics@us.schott.com

    www.us.schott.com/

    advanced_optics

    10431 ENGLISH/US 01/2020 kn/schmidt Printed in Germany

  • Optical Filter Glass

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    SCHOTT is a leading international technology group in the areas of specialty glass and glass- ceramics. With more than 130 years of outstanding development, materials and technology expertise we offer a broad portfolio of high-quality products and intelligent solutions that contribute to our customers’ success. SCHOTT Advanced Optics, with its deep technological expertise, is a valuable partner for its customers in developing products and customized solutions for applications in optics, lithography, astronomy, opto-electronics, life sciences, and research. With a product portfolio of more than 120 optical glasses, special materials and components, we master the value chain: from customized glass development to high-precision optical product finishing and metrology. SCHOTT: Your Partner for Excellence in Optics.

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    Contents

    Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

    Webshop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 1.1 General information on listed data . . . . . . . . . . . . . . . . . . . . . 12 1.2 Environmental aspects, hazardous substances,

    RoHS, ISO, REACh . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 1.3 SCHOTT optical filter glass: product portfolio . . . . . . . . 13 1.4 Positive list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

    2 Nomenclature and classification of optical filter glass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

    2.1 Group names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2.2 Classification by material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

    3 Optical properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 3.1 Refractive index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 3.2 Reflection loss at the glass-air interface . . . . . . . . . . . . . . . . 18 3.3 Transmittance and internal transmittance . . . . . . . . . . . . . 19 3.4 Derived optical filter data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 3.5 Internal transmittance graphs . . . . . . . . . . . . . . . . . . . . . . . . . . 22 3.6 Spectral characterization of optical filters . . . . . . . . . . . . . 24 3.7 Dependence of spectral transmission on

    temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 3.8 Luminescence / fluorescence . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 3.9 Color . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 3.10 Brightness / photopic transmittance . . . . . . . . . . . . . . . . . . . . 35

    4 Thermal and mechanical properties . . . . . . . . . . . . . . . . . 36 4.1 Mechanical density ρ [g/cm3] . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 4.2 Knoop hardness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 4.3 Strength . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 4.4 Thermal toughening . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 4.5 Transformation temperature Tg [°C] . . . . . . . . . . . . . . . . . . . 38 4.6 Thermal expansion α [10−6/K] . . . . . . . . . . . . . . . . . . . . . . . . . . 38

    Part I · Optical Filter Glass – Description

  • 5CONTeNTs

    5 Chemical properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 5.1 Stain resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 5.2 Acid resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 5.3 Alkali resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 5.4 Identification of visible surface changes . . . . . . . . . . . . . . . 42 5.5 Resistance against humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 5.6 Solarization effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

    6 Internal quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 6.1 Bubbles and inclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 6.2 Striae . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 6.3 Homogeneity of refractive index . . . . . . . . . . . . . . . . . . . . . . . 47

    7 Further processing of optical filter glass . . . . . . . . . . . . 48 7.1 Polished optical filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 7.2 Coatings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

    1 Optical filter glass: product line . . . . . . . . . . . . . . . . . . . . . . . . 52

    2 Optical filter glass: guaranteed values . . . . . . . . . . . . . . . . . 55

    3 Optical filter glass: references values . . . . . . . . . . . . . . . . . . 61

    4 Internal transmittance graphs . . . . . . . . . . . . . . . . . . . . . . . . . . 66

    5 Tolerances for polished filters . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 Polished surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 Optical quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

    Part II · Optical Filter Glass – Properties

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    Optical Filter Glass Part I – Description

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    Foreword

    SCHOTT Advanced Optics offers a wide range of optical filter glasses for any spectral solution to meet individual require- ments and enable customized solutions.

    Optical filter glass is known for its selective absorption in certain wavelength ranges. The optical filter glasses appear colored if their filter effect lies within the visible light spec- trum. For more than 100 years, filters from SCHOTT have been known for their particularly high quality, purity, and outstanding properties.

    Currently, the SCHOTT Advanced Optics portfolio comprises more than 60 different optical filter glass types, all produced with great care using sophisticated industrial processes. The glasses have the following advantages:

    • High transmittance • High blocking • Filter spectra with virtually no dependency on angle of

    incidence • Superior quality, reliability, and durability • No polarization effects • Manufacture of complex glass types: high-quality surfaces,

    extremely thin, small tolerances • In-house optical and protection coating capabilities • Ability to accommodate special requirements via close

    collaboration and development efforts between customers and the SCHOTT application engineering team

    • All colored filter glass types can be used as substrates for thin film coating in the manufacture of interference filters. Thus, specific advantages (absorption properties of a colored filter glass and the reflection properties of inter- ference coatings) can be combined into one optical filter.

  • 9FOreWOrD

    SCHOTT’s optical filter glass portfolio is the product line of choice for system designers and optical engineers and is being constantly updated, reflecting market needs. While building on its capabilities, SCHOTT has also continuously expanded its optical filter glass portfolio. Thus, it now con- tains the special bandpass filters UG2A, BG57, BG66, and BG67 for UV and visible applications.

    SCHOTT’s optical filters are described in two parts whereby “Part I – Description” gives information about the most important criteria that pertain to the materials and charac- teristics of optical filters, and provides detailed technical information on each glass. The “Part II – Properties” covers additional technical information.

    If any information not covered in this catalog is needed, please contact a representative of our world wide sales team. Our experts will consult you and help in finding a solution for your needs, as we believe that close relationships with customers is the key to success.

    As we constantly strive to improve our products to your ad- vantage through innovation and new technical developments, we reserve the right to change the optical and non-optical data in our Optical Filter Glass catalog without prior notice.

    This catalog was assembled with the utmost care. However, we assume no liability in the unlikely eve