H-LAK72 by CDGM

Preferred Rare Environmentally Friendly

H-LAK72 by CDGM is a preferred optical glass with a rare melt frequency. It transmits from 0.28 to 2.40 µm with an nd of 1.713 and a Vd of 51.80665. It has medium thermal expansion (CTE of 8.4×10⁻⁶/K), excellent chemical resistance, and low 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: 0.280–2.400 µm
Optical Properties
Refractive Index (nd) 1.713
Abbe Number (Vd) 51.80665
Dispersion Formula Sellmeier
Wavelength Range 0.302 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{0.746934\,\lambda^2}{\lambda^2 - 0.00172608} + \frac{1.12653\,\lambda^2}{\lambda^2 - 0.0176391} + \frac{1.11423\,\lambda^2}{\lambda^2 - 110.122}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.4
TCE 100/300°C (10-6/K) 9.8
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-6.19 \times 10^{-6} + 2(1.16 \times 10^{-8})\,\Delta T + 3(-2.9 \times 10^{-11})\,\Delta T^2 + \frac{4.99 \times 10^{-7} + 2(8.23 \times 10^{-10})\,\Delta T}{\lambda - 0.225}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.34
Relative Cost 2.5
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) 514.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
S-LAL21 Ohara 1.703 52.379403
N-LAK10 Schott 1.72003 50.62
LAK10 Schott 1.72 50.41004
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
LAL10 Ohara 1.719995 50.254429
S-LAL10 Ohara 1.719995 50.230564
S-LAL20 Ohara 1.6993 51.112184
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
H-LAK71 CDGM 1.703 52.406734
H-LAK8A CDGM 1.72 50.343857
H-LAK8B CDGM 1.72 50.280736
H-LAK7A CDGM 1.713 53.832974
H-LAK54 CDGM 1.734 51.485829
D-LAK6 CDGM 1.69384 53.128245
D-LAK52-25 CDGM 1.72924 53.851219
D-LAK6-25 CDGM 1.69281 53.049215
H-LAK6A CDGM 1.6935 53.380441
D-LAK52 CDGM 1.7305 53.944268
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