H-K1 by CDGM

Standard Rare Environmentally Friendly

H-K1 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 1.49967 and a Vd of 62.071979. It has medium thermal expansion (CTE of 8.7×10⁻⁶/K), average chemical resistance, and 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) 1.49967
Abbe Number (Vd) 62.071979
Dispersion Formula Sellmeier
Wavelength Range 0.302 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{0.841283\,\lambda^2}{\lambda^2 - 103.642} + \frac{1.01521\,\lambda^2}{\lambda^2 - 0.00623225} + \frac{0.204021\,\lambda^2}{\lambda^2 - 0.022057}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.7
TCE 100/300°C (10-6/K) 10.4
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-4.14 \times 10^{-6} + 2(1.96 \times 10^{-8})\,\Delta T + 3(-3.87 \times 10^{-11})\,\Delta T^2 + \frac{5.49 \times 10^{-7} + 2(-2.63 \times 10^{-10})\,\Delta T}{\lambda - 0.161}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.47
Relative Cost 12.6
Mechanical Properties
Young's Modulus (GPa) 65.42
Poisson's Ratio 0.22
Knoop Hardness (kgf/mm²) 440.0
Chemical Resistance
Climatic Resistance 3
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
K11 Sumita 1.50013 61.6
K11 Schott 1.50013 61.438579
ZNC7 Hoya 1.508471 61.266087
N-ZK7 Schott 1.50847 61.19
ZKN7 Schott 1.508469 61.187789
N-ZK7A Schott 1.508054 61.04
AF32ECO Schott 1.511531 62.574031
BK1 Sumita 1.51009 63.4
BSC1 Hoya 1.510091 63.435118
BK1 Schott 1.510091 63.464788
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
K4A CDGM 1.50802 61.052897
H-K5 CDGM 1.510072 63.364525
H-K6 CDGM 1.511125 60.478905
H-K7 CDGM 1.51478 60.634896
D-K59-25 CDGM 1.51698 63.4085
H-K3 CDGM 1.50463 64.720718
D-K59 CDGM 1.5176 63.499991
D-K9-25 CDGM 1.51577 63.989637
D-K9GT-25 CDGM 1.51577 63.989637
H-K90GTI CDGM 1.51948 63.291634
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