S-LAH99 by Ohara

Standard Rare Environmentally Friendly

S-LAH99 by Ohara is a standard optical glass with a rare melt frequency. It transmits from 0.36 to 2.40 µm with an nd of 2.001 and a Vd of 29.139473. It has medium thermal expansion (CTE of 7.5×10⁻⁶/K), good chemical resistance, and low relative cost.

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) 2.001
Abbe Number (Vd) 29.139473
Dispersion Formula Sellmeier
Wavelength Range 0.404656 — 2.32542 µm
$$n(\lambda) = \sqrt{1 + \frac{2.39141\,\lambda^2}{\lambda^2 - 0.0131468} + \frac{0.439219\,\lambda^2}{\lambda^2 - 0.0553226} + \frac{2.38358\,\lambda^2}{\lambda^2 - 161.26}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.5
TCE 100/300°C (10-6/K) —
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-4.87 \times 10^{-7} + 2(9.24 \times 10^{-9})\,\Delta T + 3(-2.01 \times 10^{-11})\,\Delta T^2 + \frac{1.05 \times 10^{-6} + 2(1.26 \times 10^{-9})\,\Delta T}{\lambda - 0.266}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) 5.02
Relative Cost 2.2
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 2
Alkali Resistance —
Phosphate Resistance 1
Notes

Recommended

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Similar Glasses (Ohara)
Glass Manufacturer nd Vd Compare
S-LAH99W Ohara 2.001 29.139473
S-LAH79 Ohara 2.0033 28.27328
S-LAH98 Ohara 1.953749 32.324727
S-TIH57 Ohara 1.963 24.1144
S-LAH88 Ohara 1.916499 31.604148
S-NPH3 Ohara 1.95906 17.471252
PBH71 Ohara 1.922864 21.288699
S-LAH95 Ohara 1.903659 31.343065
PBH21 Ohara 1.922861 20.884172
L-LAH86 Ohara 1.902699 31.00532
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