H-LAK7A by CDGM

Preferred Very Common Environmentally Friendly

H-LAK7A by CDGM is a preferred optical glass with a very common melt frequency. It transmits from 0.28 to 2.40 µm with an nd of 1.713 and a Vd of 53.832974. It has low thermal expansion (CTE of 5.5×10⁻⁶/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) 53.832974
Dispersion Formula Sellmeier
Wavelength Range 0.302 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.20675\,\lambda^2}{\lambda^2 - 84.3499} + \frac{1.06718\,\lambda^2}{\lambda^2 - 0.0043819} + \frac{0.81123\,\lambda^2}{\lambda^2 - 0.0189829}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 5.5
TCE 100/300°C (10-6/K) 7.3
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.82 \times 10^{-6} + 2(1.41 \times 10^{-8})\,\Delta T + 3(-1.49 \times 10^{-11})\,\Delta T^2 + \frac{4.32 \times 10^{-7} + 2(7.94 \times 10^{-10})\,\Delta T}{\lambda - 0.207}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.74
Relative Cost 2.8
Mechanical Properties
Young's Modulus (GPa) 115.15
Poisson's Ratio 0.271
Knoop Hardness (kgf/mm²) 703.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
LAK8 Schott 1.713003 53.831633
N-LAK8 Schott 1.713 53.83
D13-54 Corning 1.713 53.843096
LAL8 Ohara 1.712995 53.845848
S-LAL8 Ohara 1.712995 53.867058
LAK8 Sumita 1.713 53.9
K-LaK8 Sumita 1.713 53.9
LAC8 Hoya 1.713 53.94
M-LAC8 Hoya 1.713 53.94
MP-LAC8-30 Hoya 1.7133 53.95
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
H-LAK71 CDGM 1.703 52.406734
H-LAK72 CDGM 1.713 51.80665
D-LAK52-25 CDGM 1.72924 53.851219
H-LAK52 CDGM 1.72916 54.684737
D-LAK52 CDGM 1.7305 53.944268
H-LAK6A CDGM 1.6935 53.380441
D-LAK6 CDGM 1.69384 53.128245
H-LAK51A CDGM 1.6968 55.526357
D-LAK6-25 CDGM 1.69281 53.049215
H-LAK2A CDGM 1.69211 54.539198
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