H-LAK52 by CDGM

Preferred Very Common Environmentally Friendly

H-LAK52 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 1.72916 and a Vd of 54.684737. It has low thermal expansion (CTE of 5.6×10⁻⁶/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) 1.72916
Abbe Number (Vd) 54.684737
Dispersion Formula Sellmeier
Wavelength Range 0.302 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{0.648529\,\lambda^2}{\lambda^2 - 0.000165816} + \frac{1.2845\,\lambda^2}{\lambda^2 - 0.0158114} + \frac{1.23775\,\lambda^2}{\lambda^2 - 85.7406}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 5.6
TCE 100/300°C (10-6/K) 7.2
Thermal Conductivity (W/mK) 0.689
Heat Capacity (J/gK) 0.479
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[6.32 \times 10^{-7} + 2(1.75 \times 10^{-8})\,\Delta T + 3(-2.89 \times 10^{-11})\,\Delta T^2 + \frac{5 \times 10^{-7} + 2(3.79 \times 10^{-10})\,\Delta T}{\lambda - 0.163}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.02
Relative Cost 4.4
Mechanical Properties
Young's Modulus (GPa) 117.61
Poisson's Ratio 0.291
Knoop Hardness (kgf/mm²) 765.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
LAL18 Ohara 1.729157 54.683134
S-LAL18 Ohara 1.729157 54.680013
TAC8 Hoya 1.72916 54.67
K-LaK18 Sumita 1.72916 54.7
LAK18 Sumita 1.72916 54.7
TAC8P Hoya 1.72916 54.54
N-LAK34 Schott 1.72916 54.5
S-LAL19 Ohara 1.72916 54.095223
MP-TAC80-60 Hoya 1.72963 54.07
M-TAC80 Hoya 1.72903 54.04
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
D-LAK52 CDGM 1.7305 53.944268
D-LAK52-25 CDGM 1.72924 53.851219
H-LAK7A CDGM 1.713 53.832974
H-LAK61 CDGM 1.740999 52.676196
H-LAK54 CDGM 1.734 51.485829
H-LAK72 CDGM 1.713 51.80665
H-LAK71 CDGM 1.703 52.406734
H-LAK53B CDGM 1.755 52.322058
H-LAK53A CDGM 1.755 52.320574
H-LAK3 CDGM 1.74693 50.950085
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