D-LAF53-25 by CDGM

Preferred Medium Precision Molding Environmentally Friendly

D-LAF53-25 by CDGM is a preferred optical glass with a medium melt frequency. It transmits from 0.29 to 2.40 µm with an nd of 1.7421 and a Vd of 49.246024. It has low thermal expansion (CTE of 5.6×10⁻⁶/K), excellent chemical resistance, high relative cost, and precision molding compatibility.

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: 0.290–2.400 µm
Optical Properties
Refractive Index (nd) 1.7421
Abbe Number (Vd) 49.246024
Dispersion Formula Sellmeier
Wavelength Range 0.302 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.32239\,\lambda^2}{\lambda^2 - 0.00606224} + \frac{0.646347\,\lambda^2}{\lambda^2 - 0.0234824} + \frac{1.17508\,\lambda^2}{\lambda^2 - 87.8164}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 5.6
TCE 100/300°C (10-6/K) 7.2
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[7.67 \times 10^{-6} + 2(2.36 \times 10^{-8})\,\Delta T + 3(-1.95 \times 10^{-10})\,\Delta T^2 + \frac{6.35 \times 10^{-7} + 2(3.67 \times 10^{-10})\,\Delta T}{\lambda - 0.208}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.26
Relative Cost 12.6
Mechanical Properties
Young's Modulus (GPa) 119.78
Poisson's Ratio 0.298
Knoop Hardness (kgf/mm²) 673.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Notes

anneal rate:25℃/h

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
K-LaFn5 Sumita 1.743 49.2
LAFN5 Sumita 1.743 49.2
L-LAM60 Ohara 1.743198 49.295578
LAM60 Ohara 1.743198 49.309053
NBF1 Hoya 1.7433 49.22
S-LAM60 Ohara 1.743198 49.339444
MP-NBF1 Hoya 1.7433 49.33
MC-NBF1 Hoya 1.7433 49.33
M-NBF1 Hoya 1.7433 49.33
N-LAF35 Schott 1.7433 49.4
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
H-LAF53 CDGM 1.7433 49.221808
D-LAF53 CDGM 1.7433 49.325949
H-LAK3 CDGM 1.74693 50.950085
H-LAK54 CDGM 1.734 51.485829
H-LAF6LA CDGM 1.757 47.711817
H-LAK8B CDGM 1.72 50.280736
H-LAK8A CDGM 1.72 50.343857
D-LAF050-25 CDGM 1.76709 49.197491
H-LAK61 CDGM 1.740999 52.676196
H-LAK53A CDGM 1.755 52.320574
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