Refractive index database

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Optical constants of SiO2 (Silicon dioxide, Silica, Quartz)
Popova et al. 1972: Fused silica; n,k 7–50 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants


Room temperature.


1) S. Popova, T. Tolstykh, V. Vorobev. Optical characteristics of amorphous quartz in the 1400–200 cm-1 region, Opt. Spectrosc. 33, 444–445 (1972), as cited in Ref. 2
2) R. Kitamura, L. Pilon, M. Jonasz. Optical constants of silica glass from extreme ultraviolet to far infrared at near room temperature, Appl. Opt. 33, 8118-8133 (2007)
* Ref. 2 provides a model for calculating optical constants; model parameters are derived by fitting experimental data from Ref. 1.
[Calculation script (Python)]


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Silicon dioxide, SiO2

Silicon dioxide (SiO2), commonly known as silica, is found naturally in several crystalline forms, the most notable being quartz. Additionally, when silicon dioxide is manufactured without the crystalline structure, it forms what is known as fused silica. Fused silica is a non-crystalline (or amorphous) form of silicon dioxide and is produced by melting high purity silica at extremely high temperatures. It has superior optical clarity, especially in the ultraviolet (UV) range, and is resistant to thermal shock, making it valuable for many high-end optical applications, including lenses and windows in spacecraft and satellites. SiO2 is extensively used in electronics as an insulator and serves as a primary ingredient in the production of glass. It's also used in thin-film optics, often as antireflection coatings on optical devices. Beyond its optical applications, silicon dioxide finds use in ceramics, construction, and even as a food additive.

Other names

  • Quartz
  • Silica
  • Silicon oxide
  • Silicon(IV) dioxide


  • Alpha quartz (α-quartz, most common)
  • Beta quartz (β-quartz, only stable at temperatures above 573 °C)
  • Tridymite
  • Cristobalite
  • Coesite
  • Stishovite
  • Lechatelierite
  • Chalcedony

External links