LAH80 by Ohara

Special Unknown Environmentally Friendly

LAH80 by Ohara is a special optical glass. It transmits from 0.36 to 2.40 µm with an nd of 1.885 and a Vd of 30.163795. It has medium thermal expansion (CTE of 6.6×10⁻⁶/K) and good chemical resistance.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.404656–2.32542 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.404656–2.32542 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.360–2.400 µm
Optical Properties
Refractive Index (nd) 1.885
Abbe Number (Vd) 30.163795
Dispersion Formula Sellmeier
Wavelength Range 0.404656 — 2.32542 µm
$$n(\lambda) = \sqrt{1 + \frac{2.06636\,\lambda^2}{\lambda^2 - 0.0122134} + \frac{0.349316\,\lambda^2}{\lambda^2 - 0.055596} + \frac{1.91746\,\lambda^2}{\lambda^2 - 125.474}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.6
TCE 100/300°C (10-6/K) —
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[2.6 \times 10^{-6} + 2(1.15 \times 10^{-8})\,\Delta T + 3(-3.36 \times 10^{-11})\,\Delta T^2 + \frac{8.82 \times 10^{-7} + 2(1.2 \times 10^{-9})\,\Delta T}{\lambda - 0.279}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.99
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 2
Stain Resistance —
Acid Resistance 2
Alkali Resistance —
Phosphate Resistance 1
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
IRG2 Generic IR 1.891717 29.896648
TAFD20 Hoya 1.90315 29.835563
N-LASF46 Schott 1.90138 31.64
H-ZLAF75A CDGM 1.90366 31.31497
N-LASF46A Schott 1.90366 31.32
TAFD25L Hoya 1.90366 31.32
N-LASF46B Schott 1.90366 31.32
TAFD25 Hoya 1.90366 31.32
H-ZLAF75C CDGM 1.90366 31.357126
H-ZLAF75B CDGM 1.90366 31.418411
Similar Glasses (Ohara)
Glass Manufacturer nd Vd Compare
L-LAH86 Ohara 1.902699 31.00532
LAH78 Ohara 1.901355 31.550244
S-LAH95 Ohara 1.903659 31.343065
S-LAH88 Ohara 1.916499 31.604148
S-NBH57 Ohara 1.850249 30.046429
S-LAH71 Ohara 1.850259 32.27012
LAH71 Ohara 1.850259 32.28594
LAH75 Ohara 1.873996 35.258591
S-LAH75 Ohara 1.873996 35.258594
L-NBH54 Ohara 1.902 25.101413
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