L-LAH83 by Ohara

Obsolete Unknown Precision Molding Environmentally Friendly

L-LAH83 by Ohara is an obsolete optical glass. It transmits from 0.31 to 2.40 µm with an nd of 1.864 and a Vd of 40.577742. It has medium thermal expansion (CTE of 6.8×10⁻⁶/K), average chemical resistance, and precision molding compatibility.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.31–2.4 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.31–2.4 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.310–2.400 µm
Optical Properties
Refractive Index (nd) 1.864
Abbe Number (Vd) 40.577742
Dispersion Formula Sellmeier
Wavelength Range 0.31 — 2.4 µm
$$n(\lambda) = \sqrt{1 + \frac{1.82332\,\lambda^2}{\lambda^2 - 0.00911469} + \frac{0.548626\,\lambda^2}{\lambda^2 - 0.032842} + \frac{1.63183\,\lambda^2}{\lambda^2 - 123.611}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.8
TCE 100/300°C (10-6/K) 8.0
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[3.99 \times 10^{-6} + 2(9.76 \times 10^{-9})\,\Delta T + 3(-1.73 \times 10^{-11})\,\Delta T^2 + \frac{7.56 \times 10^{-7} + 2(7.71 \times 10^{-10})\,\Delta T}{\lambda - 0.225}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) 5.29
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 3
Stain Resistance —
Acid Resistance 3
Alkali Resistance —
Phosphate Resistance 1
Notes

Low Softening Temperature

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
E65-40 Corning 1.865 40.112393
TAFD32 Hoya 1.8707 40.73
LASFN13 Sumita 1.863 41.6
D-ZLAF85LS CDGM 1.8545 40.593546
K-VC185 Sumita 1.85375 40.6
D-ZLAF85L CDGM 1.8537 40.579411
D-ZLAF85LS-25 CDGM 1.85344 40.557917
D-ZLAF85L-25 CDGM 1.8526 40.534071
D-ZLAF85A CDGM 1.85222 40.10819
MC-TAFD305 Hoya 1.85135 40.1
Similar Glasses (Ohara)
Glass Manufacturer nd Vd Compare
L-LAH85 Ohara 1.854 40.393284
L-LAH85V Ohara 1.854 40.378368
S-LAH89 Ohara 1.8515 40.782269
S-LAH58 Ohara 1.882997 40.765107
LAH58 Ohara 1.882997 40.778667
L-LAH94 Ohara 1.860999 37.097767
L-LAH90 Ohara 1.8322 40.097595
S-LAH55 Ohara 1.834807 42.713673
LAH55 Ohara 1.834807 42.72372
S-LAH55V Ohara 1.834807 42.725324
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