LAH78 by Ohara

Obsolete Unknown Environmentally Friendly
Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.3–2.4 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.3–2.4 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.360–2.400 µm
Optical Properties
Refractive Index (nd) 1.901355
Abbe Number (Vd) 31.550244
Dispersion Formula Sellmeier
Wavelength Range 0.3 — 2.4 µm
$$n(\lambda) = \sqrt{1 + \frac{2.08123\,\lambda^2}{\lambda^2 - 0.0111906} + \frac{0.398632\,\lambda^2}{\lambda^2 - 0.0521753} + \frac{2.21679\,\lambda^2}{\lambda^2 - 141.893}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.0
TCE 100/300°C (10-6/K) 7.4
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[7.34 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.48
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance —
Stain Resistance —
Acid Resistance 3
Alkali Resistance —
Phosphate Resistance 1
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd
N-LASF46 Schott 1.90138 31.64
H-ZLAF75B CDGM 1.90366 31.418411
H-ZLAF75C CDGM 1.90366 31.357126
N-LASF46A Schott 1.90366 31.32
TAFD25 Hoya 1.90366 31.32
TAFD25L Hoya 1.90366 31.32
N-LASF46B Schott 1.90366 31.32
H-ZLAF75A CDGM 1.90366 31.31497
TAFD20 Hoya 1.90315 29.835563
LASF18A Schott 1.913482 32.364492
Similar Glasses (Ohara)
Glass Manufacturer nd Vd
S-LAH95 Ohara 1.903659 31.343065
L-LAH86 Ohara 1.902699 31.00532
S-LAH88 Ohara 1.916499 31.604148
LAH80 Ohara 1.885 30.163795
S-LAH93 Ohara 1.90525 35.036826
LAH75 Ohara 1.873996 35.258591
S-LAH75 Ohara 1.873996 35.258594
S-LAH92 Ohara 1.891899 37.134024
L-NBH54 Ohara 1.902 25.101413
S-LAH71 Ohara 1.850259 32.27012
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