H-LAK3 by CDGM

Standard Rare Environmentally Friendly

H-LAK3 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 1.74693 and a Vd of 50.950085. It has low thermal expansion (CTE of 6.0×10⁻⁶/K), excellent chemical resistance, and high relative cost.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.365–2.325 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.365–2.325 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.320–2.400 µm
Optical Properties
Refractive Index (nd) 1.74693
Abbe Number (Vd) 50.950085
Dispersion Formula Sellmeier
Wavelength Range 0.365 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.27801\,\lambda^2}{\lambda^2 - 90.683} + \frac{1.19474\,\lambda^2}{\lambda^2 - 0.0181705} + \frac{0.793028\,\lambda^2}{\lambda^2 - 0.00108737}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.0
TCE 100/300°C (10-6/K) 7.4
Thermal Conductivity (W/mK) 0.688
Heat Capacity (J/gK) 0.471
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.08
Relative Cost 9.4
Mechanical Properties
Young's Modulus (GPa) 114.71
Poisson's Ratio 0.25
Knoop Hardness (kgf/mm²) 672.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
LAK28 Schott 1.744287 50.770906
N-LAK28 Schott 1.74429 50.77
M-TAC60 Hoya 1.75501 51.16
MP-TAC60-90 Hoya 1.75591 51.18
N-LAK33A Schott 1.75393 52.27
N-LAF35 Schott 1.7433 49.4
S-LAM60 Ohara 1.743198 49.339444
M-NBF1 Hoya 1.7433 49.33
MP-NBF1 Hoya 1.7433 49.33
MC-NBF1 Hoya 1.7433 49.33
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
D-LAF53 CDGM 1.7433 49.325949
H-LAK53A CDGM 1.755 52.320574
H-LAK53B CDGM 1.755 52.322058
H-LAF53 CDGM 1.7433 49.221808
D-LAF53-25 CDGM 1.7421 49.246024
H-LAK54 CDGM 1.734 51.485829
H-LAK61 CDGM 1.740999 52.676196
D-LAF050-25 CDGM 1.76709 49.197491
D-LAF050 CDGM 1.76842 49.28216
H-LAF6LA CDGM 1.757 47.711817
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