D-LAF79 by CDGM

Standard Rare Precision Molding Environmentally Friendly

D-LAF79 by CDGM is a standard optical glass with a rare melt frequency. It transmits from 0.34 to 2.40 µm with an nd of 1.73077 and a Vd of 40.508021. It has medium thermal expansion (CTE of 9.0×10⁻⁶/K), average chemical resistance, high relative cost, and precision molding compatibility.

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: 0.340–2.400 µm
Optical Properties
Refractive Index (nd) 1.73077
Abbe Number (Vd) 40.508021
Dispersion Formula Sellmeier
Wavelength Range 0.365 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{0.265305\,\lambda^2}{\lambda^2 - 0.0420844} + \frac{1.45255\,\lambda^2}{\lambda^2 - 117.349} + \frac{1.6517\,\lambda^2}{\lambda^2 - 0.00935612}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 9.0
TCE 100/300°C (10-6/K) 11.1
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-1.27 \times 10^{-6} + 2(1.38 \times 10^{-8})\,\Delta T + 3(-3.18 \times 10^{-11})\,\Delta T^2 + \frac{8.43 \times 10^{-7} + 2(4.94 \times 10^{-10})\,\Delta T}{\lambda - 0.215}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.21
Relative Cost 17.1
Mechanical Properties
Young's Modulus (GPa) 110.34
Poisson's Ratio 0.263
Knoop Hardness (kgf/mm²) 618.0
Chemical Resistance
Climatic Resistance 3
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Notes

anneal rate:4℃/h

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
L-LAM69 Ohara 1.73077 40.508156
MP-LAF81 Hoya 1.73077 40.5
M-LAF81 Hoya 1.73077 40.5
LAFN8 Schott 1.735197 41.590899
S-LAM58 Ohara 1.72 41.978463
LAM58 Ohara 1.72 41.989859
LAFL6 Hoya 1.72 42.016239
LAFN10 Sumita 1.72016 42.1
BASF51 Schott 1.723728 38.111094
BAH78 Ohara 1.723421 38.03427
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
D-LAF79-25 CDGM 1.72986 40.497566
H-ZBAF21 CDGM 1.72341 37.991564
H-LAF62 CDGM 1.72 43.680739
H-ZBAF20 CDGM 1.70154 41.148468
H-LAF55 CDGM 1.762 40.105472
H-LAFL5 CDGM 1.75367 37.491665
H-LAF3B CDGM 1.744 44.900027
H-TF8 CDGM 1.72046 34.757746
H-LAF4 CDGM 1.7495 34.989266
H-LAF4GT CDGM 1.7495 34.989266
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