D-LAF50-25 by CDGM

Preferred Very Common Precision Molding Environmentally Friendly

D-LAF50-25 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 1.77288 and a Vd of 49.519338. It has medium thermal expansion (CTE of 7.3×10⁻⁶/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: 0.300–2.400 µm
Optical Properties
Refractive Index (nd) 1.77288
Abbe Number (Vd) 49.519338
Dispersion Formula Sellmeier
Wavelength Range 0.302 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{0.7347\,\lambda^2}{\lambda^2 - 0.0226667} + \frac{1.33717\,\lambda^2}{\lambda^2 - 0.00601677} + \frac{1.13513\,\lambda^2}{\lambda^2 - 95.7513}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.3
TCE 100/300°C (10-6/K) 8.9
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.53 \times 10^{-6} + 2(1.43 \times 10^{-8})\,\Delta T + 3(-3.83 \times 10^{-11})\,\Delta T^2 + \frac{5.87 \times 10^{-7} + 2(4.1 \times 10^{-10})\,\Delta T}{\lambda - 0.222}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.93
Relative Cost 15.6
Mechanical Properties
Young's Modulus (GPa) 120.98
Poisson's Ratio 0.302
Knoop Hardness (kgf/mm²) 614.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Notes

anneal rate:25℃/h

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Glass Manufacturer nd Vd Compare
MP-TAF105 Hoya 1.7725 49.5
M-TAF105 Hoya 1.7725 49.5
MC-TAF105 Hoya 1.7725 49.5
LAFN28 Schott 1.773142 49.568242
MC-TAF1 Hoya 1.7725 49.46
M-TAF1 Hoya 1.7725 49.46
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
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
H-LAF50B CDGM 1.7725 49.598996
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
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