L-LAH87 by Ohara

Obsolete Unknown Precision Molding Environmentally Friendly

L-LAH87 by Ohara is an obsolete optical glass. It transmits from 0.30 to 2.40 µm with an nd of 1.7703 and a Vd of 47.401904. It has medium thermal expansion (CTE of 7.1×10⁻⁶/K), below average chemical resistance, and precision molding compatibility.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.365–2.325 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.365–2.325 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.300–2.400 µm
Optical Properties
Refractive Index (nd) 1.7703
Abbe Number (Vd) 47.401904
Dispersion Formula Sellmeier
Wavelength Range 0.365 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.44196\,\lambda^2}{\lambda^2 - 0.00731827} + \frac{0.617507\,\lambda^2}{\lambda^2 - 0.0245371} + \frac{1.2189\,\lambda^2}{\lambda^2 - 105.976}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.1
TCE 100/300°C (10-6/K) —
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[6.1 \times 10^{-6} + 2(9.05 \times 10^{-9})\,\Delta T + 3(-1.35 \times 10^{-11})\,\Delta T^2 + \frac{7.87 \times 10^{-7} + 2(7.19 \times 10^{-10})\,\Delta T}{\lambda - 0.19}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.34
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 2
Stain Resistance —
Acid Resistance 51
Alkali Resistance —
Phosphate Resistance 2
Notes

Low Softening Temperature

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Glass Manufacturer nd Vd Compare
MC-TAF401 Hoya 1.77377 47.17
M-TAF401 Hoya 1.77377 47.17
MP-TAF401 Hoya 1.77377 47.17
LAFN24 Schott 1.757191 47.81177
H-LAF6LA CDGM 1.757 47.711817
NBF2 Hoya 1.756999 47.712499
D-LAF050-25 CDGM 1.76709 49.197491
M-TAF101 Hoya 1.76802 49.24
MC-TAF101-100 Hoya 1.76902 49.29
MP-TAF101-100 Hoya 1.76902 49.29
Similar Glasses (Ohara)
Glass Manufacturer nd Vd Compare
S-LAH96 Ohara 1.76385 48.488692
LAM54 Ohara 1.756998 47.815604
S-LAM54 Ohara 1.756998 47.82317
L-LAH91 Ohara 1.7645 49.096913
S-LAH66 Ohara 1.772499 49.598371
LAH66 Ohara 1.772499 49.60134
LAH64 Ohara 1.788001 47.385275
S-LAH64 Ohara 1.788001 47.368522
YGH52 Ohara 1.7865 50.001717
S-YGH52 Ohara 1.7865 50.001717
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