L-LAM72 by Ohara
Obsolete
Unknown
Precision Molding
Environmentally Friendly
Refractive Index vs Wavelength
Refractive Index Calculator
dn/dλ vs Wavelength
dn/dλ Calculator
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
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
Similar Glasses (Other Manufacturers)
Similar Glasses (Ohara)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| 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 |