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VG20 - a new NIR absorbing optical filter glass
 

VG20 - a new NIR absorbing optical filter glass

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SCHOTT’s new, 1 mm thin bandpass filter glass VG20 ensures a clear view while protecting against laser beams

SCHOTT’s new, 1 mm thin bandpass filter glass VG20 ensures a clear view while protecting against laser beams

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    VG20 - a new NIR absorbing optical filter glass VG20 - a new NIR absorbing optical filter glass Presentation Transcript

    • VG20 - a new NIR absorbing optical filter glass Dr. Ralf Biertümpfel 14.05.2013 VG20 NIR cut-off filter, Dr. Ralf Biertümpfel 14.5.2013
    • SCHOTT Advanced Optics – Optische Filter 2013 Agenda © SCHOTT AG Agenda Introduction to absorption filter glass NIR absorbing glasses VG20 – properties and advantages VG20 NIR cut-off filter, Dr. Ralf Biertümpfel 14.5.2013 2
    • SCHOTT Advanced Optics – Optische Filter 2013 © SCHOTT AG SCHOTT AG Business segments Introduction VG20 NIR cut-off filter, Dr. Ralf Biertümpfel 14.5.2013 Optical Industries Home Tech Home Appliances Precision Materials Pharmaceutical Systems Advanced Optics Flat Glass Electronic Packaging Lighting and Imaging 3
    • SCHOTT Advanced Optics – Optische Filter 2013 © SCHOTT AG SCHOTT Advanced Optics: materials and legal regulations  IMSU Integrated Management System for Safety and Environmental Protection  EHS Environmental, Health and Safety Management System  RoHS European Regulation on hazardous substances Some of the optical filter glasses contain lead or cadmium. They are in compliance with RoHS according to exemption 13b documented in ANNEX III of the directive 2011/65/EU  REACH Registration, Evaluation and Authorization of Chemical Substances Introduction VG20 NIR cut-off filter, Dr. Ralf Biertümpfel 14.5.2013 4
    • SCHOTT Advanced Optics – Optische Filter 2013 © SCHOTT AG Absorption Filter – Optical Filter Glass – Volume Filter Introduction VG20 NIR cut-off filter, Dr. Ralf Biertümpfel 14.5.2013  Unwanted light spectrum is absorbed and dissipated as heat  Optical filter glass is also called: color filter absorption filter volume filter Light source Filter Detector 5
    • SCHOTT Advanced Optics – Optische Filter 2013 © SCHOTT AG Introduction VG20 NIR cut-off filter, Dr. Ralf Biertümpfel 14.5.2013 6
    • SCHOTT Advanced Optics – Optische Filter 2013 Agenda © SCHOTT AG Agenda Introduction to absorption filter glass NIR absorbing glasses VG20 – properties and advantages VG20 NIR cut-off filter, Dr. Ralf Biertümpfel 14.5.2013 7
    • SCHOTT Advanced Optics – Optische Filter 2013 © SCHOTT AG Requirements for NIR / IR absorbers NIR absorbing glasses VG20 NIR cut-off filter, Dr. Ralf Biertümpfel 14.5.2013  Transmitting visible light and preserve colors.  Absorbing NIR light.  Steep transition between passband region and blocking region.  Heat resistance – maintain optical properties.  Suitable for imaging optics:  reproducible optical properties  high stability of refractive index  low variation of cut-off wavelength  batch to batch repeatability 8
    • SCHOTT Advanced Optics – Optische Filter 2013 © SCHOTT AG Transmittance of NIR / IR absorbers NIR absorbing glasses VG20 NIR cut-off filter, Dr. Ralf Biertümpfel 14.5.2013 9 VG20 S8022, S8023 BG60, BG61, BG62 BG38 to BG55 KG1, KG2, KG3, KG5
    • SCHOTT Advanced Optics – Optische Filter 2013 © SCHOTT AG NIR absorbing glasses VG20 NIR cut-off filter, Dr. Ralf Biertümpfel 14.5.2013 More details: diabatic scale of transmittance of NIR / IR absorbers with true color vision KG5 BG39 BG42 BG62 10
    • SCHOTT Advanced Optics – Optische Filter 2013 Agenda © SCHOTT AG Agenda Introduction to absorption filter glass NIR absorbing glasses VG20 – properties and advantages VG20 NIR cut-off filter, Dr. Ralf Biertümpfel 14.5.2013 11
    • SCHOTT Advanced Optics – Optische Filter 2013 © SCHOTT AG VG20 – properties and advantages VG20 NIR cut-off filter, Dr. Ralf Biertümpfel 14.5.2013 VG20 has much higher absorption in the NIR 12 thickness = 2 mm thickness = 1 mm 10-5 10-8
    • SCHOTT Advanced Optics – Optische Filter 2013 © SCHOTT AG VG20 – properties and advantages VG20 NIR cut-off filter, Dr. Ralf Biertümpfel 14.5.2013 Smallest thickness for low transmittance at 633 nm 13
    • SCHOTT Advanced Optics – Optische Filter 2013 © SCHOTT AG VG20 – properties and advantages VG20 NIR cut-off filter, Dr. Ralf Biertümpfel 14.5.2013 True color vision: red light is absobed, other colors transmit through the filter VG20 14
    • SCHOTT Advanced Optics – Optische Filter 2013 © SCHOTT AG VG20 – properties and advantages VG20 NIR cut-off filter, Dr. Ralf Biertümpfel 14.5.2013 VG20 has high optical quality and is optimized for imaging optics nd = 1,5405 ne = 1,5426 nd = 60,6 ne = 60,2 15
    • SCHOTT Advanced Optics – Optische Filter 2013 © SCHOTT AG VG20 – properties and advantages VG20 NIR cut-off filter, Dr. Ralf Biertümpfel 14.5.2013 Environmentally Robust: Advantage of VG20 in hot and humid conditions  High heat and humidity tests (85 °C / 85 %rH)  Clear glass as well as plastic can show surface corrosion . Typically this effect is more dominant for blue glasses. “Normal Blue Glass” (like BG39) is a phosphate based glass.  BG60/BG61: fluoro-phosphate glasses exhibit much less corrosion  New VG20 exhibits same environmental properties as BG60 Illustration of corrosion: Blue Glass before test Blue Glass with severe corrosion VG20 after 250h 85 °C / 85 %rH 16
    • SCHOTT Advanced Optics – Optische Filter 2013 © SCHOTT AG VG20 – properties and advantages VG20 NIR cut-off filter, Dr. Ralf Biertümpfel 14.5.2013 VG20 is available as polished filters or as coated component  Available sizes: up to 80 mm (greater size on request)  Minimum thickness = 0.7 mm  Surface qualities • standard = 60/40 or 5/3x0.63 • premium = 40/20 or 5/3x0.16  Wavefront deformation is low  Additional coatings: • AR • UV- and/or NIR-cutoff • etc… 17
    • SCHOTT Advanced Optics – Optische Filter 2013 © SCHOTT AG SCHOTT’s VG20 uniqueness VG20 a NIR absorbing optical glass filter VG20 NIR cut-off filter, Dr. Ralf Biertümpfel 14.5.2013  Excellent climatic resistance  Uncoated filter glass withstands more than 250 h at 85 °C / 85% rH  VG20 is easily coated. Climatic resistance Reproduc- ability & Repeatability Application  Continuous production – less variation than pot melt  High stability of transmission vs. wavelength characteristics  Reproducible optical properties (refractive index & dispersion)  Negligible variations from melt to melt  True color vision  High absorption in the NIR at a small glass thickness  Applicable for laser safety, imaging optics, NVIS 18
    • Thank you very much for your attention VG20 NIR cut-off filter, Dr. Ralf Biertümpfel 14.5.2013
    • SCHOTT Advanced Optics – Optische Filter 2013 © SCHOTT AG Back up VG20 NIR cut-off filter, Dr. Ralf Biertümpfel 14.5.2013 20
    • SCHOTT Advanced Optics – Optische Filter 2013 © SCHOTT AG 129 years of experience  1884 SCHOTT was founded Production of optical glasses  1886 Production of first filter glasses 1. History of Filters at SCHOTT VG20 NIR cut-off filter, Dr. Ralf Biertümpfel 14.5.2013 Source: SCHOTT AG (Glasmuseum, Jena), July 1886Source: SCHOTT Optischer Glaskatalog, July 1886, p. 19 21
    • SCHOTT Advanced Optics – Optische Filter 2013 © SCHOTT AG History of Interference Filters  Dr. Walter Geffcken (SCHOTT) was one of the first who invented interference filters, especially AR coatings.  1939 Patent of “Metal dielectric interference filters (Fabry Perot resonator)” DE 716153  1940 Patent of “Coatings with reduced surface reflections” CH223344  1942 Patent of “All dielectric interference filters” using several optical films DE742463 1. History of Filters at SCHOTT VG20 NIR cut-off filter, Dr. Ralf Biertümpfel 14.5.2013 22
    • SCHOTT Advanced Optics – Optische Filter 2013 © SCHOTT AG The new catalogue for Optical Filter Glass 3. Filter Glass Catalogue VG20 NIR cut-off filter, Dr. Ralf Biertümpfel 14.5.2013 Our new catalogue of Optical Filter Glasses has two parts Description part  Introduction  Nomenclature  Description of glass properties  Important formulas  Background information 23
    • SCHOTT Advanced Optics – Optische Filter 2013 © SCHOTT AG The new catalogue for Optical Filter Glass 3. Filter Glass Catalogue VG20 NIR cut-off filter, Dr. Ralf Biertümpfel 14.5.2013 Our new catalogue of Optical Filter Glasses has two parts Properties part  Portfolio  Guaranteed values  Detailed data  Transmittance curves  Geometry of polished filters 24
    • SCHOTT Advanced Optics – Optische Filter 2013 © SCHOTT AG The new Catalogue of Interference Filter 5. Interference Filter Catalogue VG20 NIR cut-off filter, Dr. Ralf Biertümpfel 14.5.2013 Our new catalogue of Interference Filters has two parts Description part  Introduction  Basics of interference  Description filter properties  Important formulas and definitions  Background information 25
    • SCHOTT Advanced Optics – Optische Filter 2013 © SCHOTT AG The new Catalogue of Interference Filter 5. Interference Filter Catalogue VG20 NIR cut-off filter, Dr. Ralf Biertümpfel 14.5.2013 Our new catalogue of Interference Filters has two parts Properties part  Portfolio  Guaranteed values  Detailed data  Typical transmittance curves  Special filters 26