N-BK7HTSultra by Schott

Preferred Unknown Environmentally Friendly

N-BK7HTSultra by Schott is a preferred optical glass. It transmits from 0.31 to 2.50 µm with an nd of 1.5168 and a Vd of 64.17. It has medium thermal expansion (CTE of 7.1×10⁻⁶/K) and good chemical resistance.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.31–2.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.31–2.5 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.310–2.500 µm
Optical Properties
Refractive Index (nd) 1.5168
Abbe Number (Vd) 64.17
Dispersion Formula Sellmeier
Wavelength Range 0.31 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.03961\,\lambda^2}{\lambda^2 - 0.0060007} + \frac{0.231792\,\lambda^2}{\lambda^2 - 0.0200179} + \frac{1.01047\,\lambda^2}{\lambda^2 - 103.561}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.1
TCE 100/300°C (10-6/K) 8.3
Thermal Conductivity (W/mK) 1.11
Heat Capacity (J/gK) 0.858
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.86 \times 10^{-6} + 2(1.31 \times 10^{-8})\,\Delta T + 3(-1.37 \times 10^{-11})\,\Delta T^2 + \frac{4.34 \times 10^{-7} + 2(6.27 \times 10^{-10})\,\Delta T}{\lambda - 0.17}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.4994
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) 82.0
Poisson's Ratio 0.21
Knoop Hardness (kgf/mm²) 548.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance 0
Acid Resistance 1
Alkali Resistance 2
Phosphate Resistance 2
Notes

blue laser solarisation stabilized glass. only available as optical components component

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
H-K9LA CDGM 1.5168 64.198695
H-K9LAGT CDGM 1.5168 64.198695
H-K9L* CDGM 1.5168 64.198732
H-K9L CDGM 1.5168 64.198732
H-K9LGT CDGM 1.5168 64.198732
BSC7 Hoya 1.5168 64.2
B16-64 Corning 1.516804 64.224234
BSL7 Ohara 1.51633 64.150145
S-BSL7 Ohara 1.51633 64.142022
BK7 Sumita 1.51633 64.1
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
N-BK7 Schott 1.5168 64.17
N-BK7HTi Schott 1.5168 64.17
N-BK7HT Schott 1.5168 64.17
BK7 Schott 1.5168 64.167336
BK7HT Schott 1.51633 64.14348
UBK7 Schott 1.516801 64.289727
P-BK7 Schott 1.5164 64.06
BK8 Schott 1.520152 63.685744
BK7G18 Schott 1.51975 63.58
PK2 Schott 1.518211 65.054286
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