Optical Glass Catalog
Interactive glass map and dispersion curves. Sellmeier: n²(λ) = 1 + Σ Bᵢλ²/(λ² − Cᵢ), with SCHOTT catalog coefficients.
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SCHOTT Glass Properties
| Glass | nd | Vd | ρ (g/cm³) | dn/dT at 546 nm, 20 °C (×10⁻⁶/K) |
|---|---|---|---|---|
| N-BK7 | 1.51680 | 64.17 | 2.51 | +1.49 |
| N-FK5 | 1.48749 | 70.41 | 2.45 | -2.44 |
| N-BAK4 | 1.56883 | 55.98 | 3.05 | +2.40 |
| N-SK16 | 1.62041 | 60.32 | 3.58 | +0.75 |
| N-LAK9 | 1.69100 | 54.71 | 3.51 | +2.11 |
| LLF1 | 1.54814 | 45.75 | 2.94 | +1.36 |
| F2 | 1.62004 | 36.37 | 3.60 | +2.76 |
| N-LASF9 | 1.85025 | 32.17 | 4.41 | +3.30 |
| N-SF11 | 1.78472 | 25.68 | 3.22 | +0.62 |
| N-SF6 | 1.80518 | 25.36 | 3.37 | -0.21 |
Abbe Number from the Dispersion Formula
n_F (486.13 nm, H)
1.52238
n_d (587.56 nm, He)
1.51680
n_C (656.27 nm, H)
1.51432
Abbe number V_d
64.17
catalog 64.17
Temperature Coefficient dn/dT (TIE-19)
n at 20 °C
1.518722
catalog formula (relative to air)
dn/dT at T₀
1.493 ×10⁻⁶/K
absolute (vacuum)
Δn, 20 → 70 °C
9.052e-5
absolute (vacuum)
Mean dn/dT over ΔT
1.810 ×10⁻⁶/K
Data
n²(λ) = 1 + Σ Bᵢλ²/(λ² − Cᵢ), Vd = (nd − 1)/(nF − nC)
Δnabs(T) = (n² − 1)/(2n) · (D₀ΔT + D₁ΔT² + D₂ΔT³ + (E₀ΔT + E₁ΔT²)/(λ² − λTK²)), ΔT = T − 20 °C
Sellmeier coefficients, nd, Vd, density and thermo-optic coefficients from the SCHOTT optical glass catalog (2017). Each formula reproduces its catalog nd to 1e-5 and Vdto 0.01. dn/dT and Δn are absolute (in vacuum), from SCHOTT TIE-19, valid from −100 to +140 °C and 365 to 1014 nm (SCHOTT data sheets); n is the catalog index at 20 °C. Values relative to air are larger by about n × 0.9×10⁻⁶/K, from the air's own dn/dT ≈ −(nair− 1)/T. Curves cover each glass's 0.3–2.5 µm data range. The crystal and fused silica Vdcome from each set's published formula (fused silica: Malitson 1965, Vd 67.82).
Model and references
Exact. The equations are exact within the stated assumptions, or are a standard's tabulated values. The results are as good as the inputs. About the tiers
SCHOTT catalog values: Sellmeier fits that reproduce each glass's catalog n_d to 1e-5 and V_d to 0.01. V_d of the crystals and fused silica comes from their published formulas. dn/dT and Δn are TIE-19's absolute (vacuum) values for −100 to +140 °C and 365–1014 nm (SCHOTT's stated range); values relative to air are larger by about n × 0.9e-6 /K. Valid inside each fit's wavelength range.
- SCHOTT optical glass catalog (Zemax AGF 2017-01-20). Sellmeier coefficients, n_d, V_d and density.
- SCHOTT (2016). TIE-19, temperature coefficient of the absolute refractive index (D₀, D₁, D₂, E₀, E₁, λ_TK).
- SCHOTT optical glass data sheets (2017-01-20), Explanations: the dn/dT constants are valid from −100 to +140 °C and 0.365 to 1.014 µm. N-BK7 sheet: Δn_abs/ΔT at 1060 nm, e and g of 0.3, 0.8, 1.2 (−40/−20 °C) and 1.1, 1.6, 2.1 ×10⁻⁶/K (+20/+40 °C). refractiveindex.info
- Malitson I. H. (1965). Interspecimen comparison of the refractive index of fused silica. J. Opt. Soc. Am. 55, 1205. Fused silica V_d 67.82. doi:10.1364/JOSA.55.001205