S-LAH55 by Ohara

Obsolete Unknown Environmentally Friendly

S-LAH55 by Ohara is an obsolete optical glass. It transmits from 0.32 to 2.40 µm with an nd of 1.834807 and a Vd of 42.713673. It has low thermal expansion (CTE of 6.2×10⁻⁶/K) and average chemical resistance.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.33–2.4 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.33–2.4 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.320–2.400 µm
Optical Properties
Refractive Index (nd) 1.834807
Abbe Number (Vd) 42.713673
Dispersion Formula Sellmeier
Wavelength Range 0.33 — 2.4 µm
$$n(\lambda) = \sqrt{1 + \frac{1.95616\,\lambda^2}{\lambda^2 - 0.00979339} + \frac{0.319216\,\lambda^2}{\lambda^2 - 0.0376836} + \frac{1.39173\,\lambda^2}{\lambda^2 - 94.8775}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.2
TCE 100/300°C (10-6/K) 7.6
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[2.4 \times 10^{-6} + 2(1.26 \times 10^{-8})\,\Delta T + 3(-2.98 \times 10^{-11})\,\Delta T^2 + \frac{6.81 \times 10^{-7} + 2(8.19 \times 10^{-10})\,\Delta T}{\lambda - 0.211}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.73
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance —
Stain Resistance —
Acid Resistance 4
Alkali Resistance —
Phosphate Resistance 1
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
H-ZLAF55C CDGM 1.83481 42.711575
TAFD5F Hoya 1.83481 42.72
TAFD5G Hoya 1.83481 42.72
H-ZLAF55D CDGM 1.83481 42.725177
K-LaSFn8W Sumita 1.8349 42.7
K-LaSFn8 Sumita 1.835 42.7
LASFN8 Sumita 1.835 42.7
TAFD5 Hoya 1.835 42.984244
N-LASF41 Schott 1.83501 43.13
D-ZLAF61 CDGM 1.82241 42.714541
Similar Glasses (Ohara)
Glass Manufacturer nd Vd Compare
LAH55 Ohara 1.834807 42.72372
S-LAH55V Ohara 1.834807 42.725324
S-LAH55VS Ohara 1.834809 42.74368
L-LAH90 Ohara 1.8322 40.097595
S-LAH89 Ohara 1.8515 40.782269
LAH54 Ohara 1.815543 44.361146
S-LAH54 Ohara 1.815543 44.361146
L-LAH85 Ohara 1.854 40.393284
L-LAH85V Ohara 1.854 40.378368
L-LAH84P Ohara 1.81225 40.294279
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