H-LAF50B by CDGM

Preferred Very Common Environmentally Friendly

H-LAF50B by CDGM is a preferred optical glass with a very common melt frequency. It transmits from 0.30 to 2.40 µm with an nd of 1.7725 and a Vd of 49.598996. It has low thermal expansion (CTE of 5.8×10⁻⁶/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: 0.300–2.400 µm
Optical Properties
Refractive Index (nd) 1.7725
Abbe Number (Vd) 49.598996
Dispersion Formula Sellmeier
Wavelength Range 0.302 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.17461\,\lambda^2}{\lambda^2 - 82.6268} + \frac{1.6589\,\lambda^2}{\lambda^2 - 0.00805128} + \frac{0.413174\,\lambda^2}{\lambda^2 - 0.0269613}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 5.8
TCE 100/300°C (10-6/K) 7.5
Thermal Conductivity (W/mK) 0.86
Heat Capacity (J/gK) 0.499
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[2.17 \times 10^{-6} + 2(1.36 \times 10^{-8})\,\Delta T + 3(-3.28 \times 10^{-11})\,\Delta T^2 + \frac{5.95 \times 10^{-7} + 2(8.86 \times 10^{-10})\,\Delta T}{\lambda - 0.161}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.24
Relative Cost 3.4
Mechanical Properties
Young's Modulus (GPa) 123.7
Poisson's Ratio 0.29
Knoop Hardness (kgf/mm²) 723.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
S-LAH66 Ohara 1.772499 49.598371
K-LaSFn7 Sumita 1.7725 49.6
LASFN7 Sumita 1.7725 49.6
LAH66 Ohara 1.772499 49.60134
N-LAF34 Schott 1.7725 49.62
TAF1 Hoya 1.7725 49.63
LAFN28 Schott 1.773142 49.568242
MP-TAF105 Hoya 1.7725 49.5
M-TAF105 Hoya 1.7725 49.5
MC-TAF105 Hoya 1.7725 49.5
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
D-LAF50-25 CDGM 1.77288 49.519338
D-LAF50 CDGM 1.774 49.590362
D-LAF050 CDGM 1.76842 49.28216
D-LAF050-25 CDGM 1.76709 49.197491
H-LAF6LA CDGM 1.757 47.711817
H-LAF10LA CDGM 1.788 47.491731
H-LAK53A CDGM 1.755 52.320574
H-LAK53B CDGM 1.755 52.322058
H-LAK3 CDGM 1.74693 50.950085
D-LAF53 CDGM 1.7433 49.325949
Compare Glasses
    Compare Selected