H-K3 by CDGM

Standard Rare Environmentally Friendly

H-K3 by CDGM is a standard optical glass with a rare melt frequency. It transmits from 0.30 to 2.40 µm with an nd of 1.50463 and a Vd of 64.720718. It has low thermal expansion (CTE of 5.8×10⁻⁶/K), excellent chemical resistance, and moderate 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: 0.300–2.400 µm
Optical Properties
Refractive Index (nd) 1.50463
Abbe Number (Vd) 64.720718
Dispersion Formula Sellmeier
Wavelength Range 0.302 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{0.296005\,\lambda^2}{\lambda^2 - 0.018599} + \frac{0.94042\,\lambda^2}{\lambda^2 - 0.00513633} + \frac{1.00567\,\lambda^2}{\lambda^2 - 97.5554}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 5.8
TCE 100/300°C (10-6/K) 7.0
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[2.31 \times 10^{-6} + 2(2.11 \times 10^{-8})\,\Delta T + 3(-2.04 \times 10^{-11})\,\Delta T^2 + \frac{4.15 \times 10^{-7} + 2(4.8 \times 10^{-10})\,\Delta T}{\lambda - 0.136}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.4
Relative Cost 6.1
Mechanical Properties
Young's Modulus (GPa) 68.3
Poisson's Ratio 0.217
Knoop Hardness (kgf/mm²) 548.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
BSL3 Ohara 1.498308 65.026785
BK3 Schott 1.498311 65.063609
BK3 Sumita 1.49831 65.1
BSC3 Hoya 1.498309 65.130542
BSL1 Ohara 1.510091 63.635037
B10-63 Corning 1.509992 63.551713
BSC4 Hoya 1.50048 65.996466
BK4 Sumita 1.50048 66.0
BK1 Schott 1.510091 63.464788
BSC1 Hoya 1.510091 63.435118
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
H-K2 CDGM 1.50047 66.020774
H-K5 CDGM 1.510072 63.364525
D-K9-25 CDGM 1.51577 63.989637
D-K9GT-25 CDGM 1.51577 63.989637
D-K9GT CDGM 1.51633 64.058952
D-K9 CDGM 1.51633 64.058952
H-K9L CDGM 1.5168 64.198732
H-K9LGT CDGM 1.5168 64.198732
H-K9L* CDGM 1.5168 64.198732
H-K9LAGT CDGM 1.5168 64.198695
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