L-LAM72 by Ohara

Obsolete Unknown Precision Molding Environmentally Friendly

L-LAM72 by Ohara is an obsolete optical glass. It transmits from 0.29 to 2.40 µm with an nd of 1.733099 and a Vd of 48.896607. It has medium thermal expansion (CTE of 6.6×10⁻⁶/K), below average chemical resistance, and precision molding compatibility.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.29–2.4 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.29–2.4 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.290–2.400 µm
Optical Properties
Refractive Index (nd) 1.733099
Abbe Number (Vd) 48.896607
Dispersion Formula Sellmeier
Wavelength Range 0.29 — 2.4 µm
$$n(\lambda) = \sqrt{1 + \frac{1.50483\,\lambda^2}{\lambda^2 - 0.00750342} + \frac{0.433346\,\lambda^2}{\lambda^2 - 0.026901} + \frac{1.27149\,\lambda^2}{\lambda^2 - 95.7631}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.6
TCE 100/300°C (10-6/K) 8.0
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.89
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 3
Stain Resistance —
Acid Resistance 51
Alkali Resistance —
Phosphate Resistance 1
Notes

Low Softening Temperature

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Similar Glasses (Ohara)
Glass Manufacturer nd Vd Compare
L-LAM60 Ohara 1.743198 49.295578
LAM60 Ohara 1.743198 49.309053
S-LAM60 Ohara 1.743198 49.339444
S-LAL10 Ohara 1.719995 50.230564
LAL10 Ohara 1.719995 50.254429
LAM3 Ohara 1.717004 47.942632
S-LAM3 Ohara 1.717004 47.927969
S-LAL59 Ohara 1.733997 51.47057
LAL59 Ohara 1.733997 51.488026
LAM61 Ohara 1.720002 46.035166
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