H-LAK71 by CDGM

Preferred Medium Environmentally Friendly

H-LAK71 by CDGM is a preferred optical glass with a medium melt frequency. It transmits from 0.28 to 2.40 µm with an nd of 1.703 and a Vd of 52.406734. It has low thermal expansion (CTE of 5.0×10⁻⁶/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: 0.280–2.400 µm
Optical Properties
Refractive Index (nd) 1.703
Abbe Number (Vd) 52.406734
Dispersion Formula Sellmeier
Wavelength Range 0.302 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.12851\,\lambda^2}{\lambda^2 - 101.092} + \frac{0.562112\,\lambda^2}{\lambda^2 - 0.0213537} + \frac{1.27965\,\lambda^2}{\lambda^2 - 0.00668008}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 5.0
TCE 100/300°C (10-6/K) 6.6
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[7.88 \times 10^{-6} + 2(1.46 \times 10^{-8})\,\Delta T + 3(-1.42 \times 10^{-11})\,\Delta T^2 + \frac{5.79 \times 10^{-7} + 2(5.52 \times 10^{-10})\,\Delta T}{\lambda - 0.193}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.75
Relative Cost 6.4
Mechanical Properties
Young's Modulus (GPa) 117.2
Poisson's Ratio 0.294
Knoop Hardness (kgf/mm²) 743.0
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
S-LAL20 Ohara 1.6993 51.112184
K-VC80 Sumita 1.69384 53.1
L-LAL15 Ohara 1.69304 52.9306
L-LAL13 Ohara 1.6935 53.185799
MC-LAC130 Hoya 1.6935 53.2
M-LAC130 Hoya 1.6935 53.2
MP-LAC130 Hoya 1.6935 53.2
P-LAK35 Schott 1.6935 53.2
S-LAL13 Ohara 1.693501 53.205327
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
D-LAK6 CDGM 1.69384 53.128245
H-LAK72 CDGM 1.713 51.80665
D-LAK6-25 CDGM 1.69281 53.049215
H-LAK6A CDGM 1.6935 53.380441
H-LAK7A CDGM 1.713 53.832974
H-LAK2A CDGM 1.69211 54.539198
H-LAK59A CDGM 1.691 54.815309
H-LAK8A CDGM 1.72 50.343857
H-LAK8B CDGM 1.72 50.280736
H-LAK51A CDGM 1.6968 55.526357
Compare Glasses
    Compare Selected