H-K90GTI by CDGM

Standard Rare Environmentally Friendly

H-K90GTI by CDGM is a standard optical glass with a rare melt frequency. It transmits from 0.29 to 2.40 µm with an nd of 1.51948 and a Vd of 63.291634. It has medium thermal expansion (CTE of 7.8×10⁻⁶/K), excellent chemical resistance, and very high relative cost.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.302–2.325 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.302–2.325 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.290–2.400 µm
Optical Properties
Refractive Index (nd) 1.51948
Abbe Number (Vd) 63.291634
Dispersion Formula Sellmeier
Wavelength Range 0.302 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.15679\,\lambda^2}{\lambda^2 - 0.00700648} + \frac{0.960975\,\lambda^2}{\lambda^2 - 100.982} + \frac{0.121869\,\lambda^2}{\lambda^2 - 0.0249554}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.8
TCE 100/300°C (10-6/K) 9.4
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-7.71 \times 10^{-7} + 2(1.65 \times 10^{-8})\,\Delta T + 3(-4.14 \times 10^{-11})\,\Delta T^2 + \frac{4.54 \times 10^{-7} + 2(4.64 \times 10^{-10})\,\Delta T}{\lambda - 0.177}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.52
Relative Cost 50.5
Mechanical Properties
Young's Modulus (GPa) 80.22
Poisson's Ratio 0.214
Knoop Hardness (kgf/mm²) 544.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Notes

i line glass

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
BK7G18 Schott 1.51975 63.58
P-BK40 Sumita 1.5176 63.5
K-PBK40 Sumita 1.5176 63.5
BK8 Schott 1.520152 63.685744
K-PBK40(M) Sumita 1.51497 63.3
S-BSL7R Ohara 1.51633 63.881689
P-BK7 Schott 1.5164 64.06
L-BSL7 Ohara 1.51633 64.065129
K-BK7 Sumita 1.51633 64.1
BK7 Sumita 1.51633 64.1
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
D-K59 CDGM 1.5176 63.499991
D-K59-25 CDGM 1.51698 63.4085
D-K9GT-25 CDGM 1.51577 63.989637
D-K9-25 CDGM 1.51577 63.989637
D-K9GT CDGM 1.51633 64.058952
D-K9 CDGM 1.51633 64.058952
H-K9LA CDGM 1.5168 64.198695
H-K9LAGT CDGM 1.5168 64.198695
H-K9L* CDGM 1.5168 64.198732
H-K9LGT CDGM 1.5168 64.198732
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