H-LAK1 by CDGM

Standard Rare Environmentally Friendly

H-LAK1 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 1.6595 and a Vd of 57.34726. It has medium thermal expansion (CTE of 7.7×10⁻⁶/K), below 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) 1.6595
Abbe Number (Vd) 57.34726
Dispersion Formula Sellmeier
Wavelength Range 0.302 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{0.964887\,\lambda^2}{\lambda^2 - 91.1939} + \frac{0.468481\,\lambda^2}{\lambda^2 - 0.0205811} + \frac{1.23723\,\lambda^2}{\lambda^2 - 0.00608509}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.7
TCE 100/300°C (10-6/K) 8.7
Thermal Conductivity (W/mK) 0.594
Heat Capacity (J/gK) 0.437
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-4.74 \times 10^{-6} + 2(1.74 \times 10^{-8})\,\Delta T + 3(-3.67 \times 10^{-11})\,\Delta T^2 + \frac{4.92 \times 10^{-7} + 2(2.76 \times 10^{-10})\,\Delta T}{\lambda - 0.181}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.94
Relative Cost 4.6
Mechanical Properties
Young's Modulus (GPa) 88.73
Poisson's Ratio 0.281
Knoop Hardness (kgf/mm²) 560.0
Chemical Resistance
Climatic Resistance 4
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
S-LAL11 Ohara 1.658296 57.332589
LAL11 Ohara 1.658296 57.332589
K-LaK11 Sumita 1.6583 57.3
LAK11 Sumita 1.6583 57.3
LAK11 Schott 1.658302 57.261599
LAC11 Hoya 1.658296 57.262085
C57-57 Corning 1.657503 57.198059
LAK23 Schott 1.668816 57.38444
LACL7 Hoya 1.669996 57.308358
LAL52 Ohara 1.669999 57.327972
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
H-LAK50A CDGM 1.6516 58.403057
H-LAK10 CDGM 1.65113 55.890872
D-LAK70 CDGM 1.6691 55.389689
D-LAK70-25 CDGM 1.668 55.295752
H-LAK11 CDGM 1.66461 54.612239
H-LAK5A CDGM 1.6779 55.51497
H-ZK11 CDGM 1.63854 55.446553
D-LAK5-25 CDGM 1.67686 54.805426
D-LAK5 CDGM 1.6779 54.889665
H-LAK4L CDGM 1.64 60.202769
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