H-LAK11 by CDGM

Standard Rare Environmentally Friendly

H-LAK11 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 1.66461 and a Vd of 54.612239. It has medium thermal expansion (CTE of 7.2×10⁻⁶/K), average 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: 0.290–2.400 µm
Optical Properties
Refractive Index (nd) 1.66461
Abbe Number (Vd) 54.612239
Dispersion Formula Sellmeier
Wavelength Range 0.302 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.0909\,\lambda^2}{\lambda^2 - 0.00492619} + \frac{0.628436\,\lambda^2}{\lambda^2 - 0.0203181} + \frac{1.01438\,\lambda^2}{\lambda^2 - 100.531}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.2
TCE 100/300°C (10-6/K) 8.8
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-1.97 \times 10^{-6} + 2(1.61 \times 10^{-8})\,\Delta T + 3(-3.94 \times 10^{-11})\,\Delta T^2 + \frac{5.45 \times 10^{-7} + 2(2.03 \times 10^{-10})\,\Delta T}{\lambda - 0.199}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.02
Relative Cost 4.6
Mechanical Properties
Young's Modulus (GPa) 84.34
Poisson's Ratio 0.291
Knoop Hardness (kgf/mm²) 517.0
Chemical Resistance
Climatic Resistance 3
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
K-VC78(M) Sumita 1.66624 55.1
VC78 Sumita 1.6691 55.4
K-VC78 Sumita 1.66955 55.4
LACL3 Hoya 1.664798 53.401295
K-LaKn11 Sumita 1.6583 53.4
LAKN11 Sumita 1.6583 53.4
L-LAL12 Ohara 1.6779 54.88744
LAKL12 Schott 1.6779 54.92
LAKN12 Schott 1.6779 55.199566
N-LAK12 Schott 1.6779 55.2
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
D-LAK70-25 CDGM 1.668 55.295752
D-LAK70 CDGM 1.6691 55.389689
D-LAK5-25 CDGM 1.67686 54.805426
D-LAK5 CDGM 1.6779 54.889665
H-LAK5A CDGM 1.6779 55.51497
H-LAK10 CDGM 1.65113 55.890872
H-LAK1 CDGM 1.6595 57.34726
H-LAK67 CDGM 1.67 51.738482
H-LAK59A CDGM 1.691 54.815309
H-ZK11 CDGM 1.63854 55.446553
Compare Glasses
    Compare Selected