H-LAK8A by CDGM

Standard Rare Environmentally Friendly

H-LAK8A by CDGM is a standard optical glass with a rare melt frequency. It transmits from 0.32 to 2.40 µm with an nd of 1.72 and a Vd of 50.343857. It has low thermal expansion (CTE of 5.3×10⁻⁶/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: 0.320–2.400 µm
Optical Properties
Refractive Index (nd) 1.72
Abbe Number (Vd) 50.343857
Dispersion Formula Sellmeier
Wavelength Range 0.302 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.13862\,\lambda^2}{\lambda^2 - 80.0745} + \frac{0.158051\,\lambda^2}{\lambda^2 - 0.0368198} + \frac{1.73935\,\lambda^2}{\lambda^2 - 0.00909532}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 5.3
TCE 100/300°C (10-6/K) 7.2
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[4.02 \times 10^{-6} + 2(1.82 \times 10^{-8})\,\Delta T + 3(-1.04 \times 10^{-10})\,\Delta T^2 + \frac{4.87 \times 10^{-7} + 2(9.07 \times 10^{-10})\,\Delta T}{\lambda - 0.216}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.77
Relative Cost 6.3
Mechanical Properties
Young's Modulus (GPa) 109.41
Poisson's Ratio 0.292
Knoop Hardness (kgf/mm²) 607.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
LAC10 Hoya 1.72 50.35
D20-50 Corning 1.720003 50.312121
K-LaK10 Sumita 1.72 50.3
LAK10 Sumita 1.72 50.3
LAK10 Schott 1.72 50.41004
LAL10 Ohara 1.719995 50.254429
S-LAL10 Ohara 1.719995 50.230564
N-LAK10 Schott 1.72003 50.62
LAKN12 Sumita 1.7335 51.2
TAC4 Hoya 1.734 51.05
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
H-LAK8B CDGM 1.72 50.280736
H-LAK72 CDGM 1.713 51.80665
H-LAK54 CDGM 1.734 51.485829
H-LAF2 CDGM 1.717 47.888609
H-LAK71 CDGM 1.703 52.406734
D-LAF53-25 CDGM 1.7421 49.246024
D-LAF53 CDGM 1.7433 49.325949
H-LAF53 CDGM 1.7433 49.221808
H-LAF51 CDGM 1.7 48.079839
H-LAK7A CDGM 1.713 53.832974
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