Journal of Sol-Gel Science and Technology

, Volume 32, Issue 1–3, pp 161–165 | Cite as

Investigations of MgF2 Optical Thin Films Prepared from Autoclaved Sol

  • Tsuyoshi Murata
  • Hitoshi Ishizawa
  • Izumi Motoyama
  • Akira Tanaka
Article

Abstract

MgF2 thin films with ultra low refractive indices were obtained by sol–gel method using sols prepared from magnesium acetate and hydrofluoric acid. The sols were autoclaved in a Teflon cell at 100–180°C for 24 h and then coated on SiO2 glass or CaF2 crystal substrates by spin coating. Subsequently, the samples were heat treated at 150°C for 1 h. The optical properties of the thin films, such as refractive index and transmittance, were investigated in the UV region, especially in the deep UV (DUV, below 250 nm) region. Though the coatings consist of single layers, both samples exhibited high transmittance. In addition, they exhibit such antireflection effect over a very wide range of wavelength. Such a good antireflection effect was produced only by low refractive indices. It has also been confirmed that, even in the range of vacuum UV (VUV, 200–150 nm), CaF2 samples with antireflection coatings could keep such a good antireflection effect.

Keywords

sol–gel optical thin film ultra low refractive index MgF2 autoclave treatment 

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Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • Tsuyoshi Murata
    • 1
  • Hitoshi Ishizawa
    • 1
  • Izumi Motoyama
    • 1
  • Akira Tanaka
    • 1
  1. 1.Lens Engineering Development DepartmentNikon CorporationSagamiharaJapan

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