i-line Glass

Built on more than 100 years of optical material development, Nikon uses a combination of high-purity raw materials and Nikon's specialized equipment to achieve high transmittance at 365 nm (i-line).



Lenses and optical components for:

  • Semiconductor and FPD lithography systems
  • Industrial inspection equipment
  • Various observation equipment
  • *Please contact our sales department for further information on these and other applications


  • Wide variety of i-line glass types
    Nikon's proprietary technologies enable a wide lineup of glass types, from high refraction-type (7054) to low dispersion-type (4786) glass.
  • High transmittance for 365 nm (i-line)
    Combining the use of high-purity raw materials and an optimized manufacturing process, Nikon consistently produces materials with high 365 nm transmittance.
  • Refractive index homogeneity
    By optimizing both the manufacturing and critical annealing process, Nikon i-line glass materials achieve high refractive index homogeneity.
  • Solarization
    Nikon's unique technologies, raw materials and manufacturing process provide high resistance to solarization.

Product line-up

Swipe horizontally to view full table.

Glass type 4786 5859 5742 5165 7054
Refractive index
1.47410 1.59042 1.57653 1.51183 1.70623
86.8 59.5 42.1 65.0 54.7
10 mm internal transmittance
(365 nm) τi
99.8% 99.7% 99.6% 99.8% 99.4%
Refractive index
1.48726 1.61450 1.61265 1.53073 1.73811
Variation of ni within a single lot
2 2 2 10 10
Solarization Good Good Good Good Good
  • *10 mm internal transmittance:
    Indicates a representative value of the light transmittance at i-line (365 nm) with glass of 10 mm thickness, excluding reflection losses.
  • *Refractive index:
    Indicates a representative value of the refractive index at i-line (365 nm). Depending on the required quality, longer annealing time is needed and the refractive index value will change. These data are based on Nikon's typical annealing conditions.
  • *Variation of ni within a single lot:
    Indicates a guaranteed value of the refractive index variation of a part within a single lot, with the same melt and same annealing run.
  • *Solarization:
    The degree of solarization is indicated as a decrease in transmittance caused by radiation from a super-high-pressure mercury-vapor lamp at the wavelength for which a transmittance of 80% was exhibited before irradiation.
nd-νd diagram


  • *All data on this page are typical but not guaranteed values.
  • *Please ask about different sizes and specifications.

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N.B. Export of the products* on this page is controlled under the Japanese Foreign Exchange and Foreign Trade Law. Appropriate export procedure shall be required in case of export from Japan.

  • *Products: Hardware and its technical information (including software)