L-LAH91 by Ohara
Standard
Common
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) | 1.7645 |
|---|---|
| Abbe Number (Vd) | 49.096913 |
| Dispersion Formula | Sellmeier |
| Wavelength Range | 0.365015 — 2.32542 µm |
$$n(\lambda) = \sqrt{1 + \frac{1.26144\,\lambda^2}{\lambda^2 - 0.00572513} + \frac{0.782115\,\lambda^2}{\lambda^2 - 0.021983} + \frac{1.15824\,\lambda^2}{\lambda^2 - 88.0482}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 5.9 |
|---|---|
| TCE 100/300°C (10-6/K) | — |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[7.54 \times 10^{-6} + 2(1.03 \times 10^{-8})\,\Delta T + 3(1.85 \times 10^{-11})\,\Delta T^2 + \frac{6.57 \times 10^{-7} + 2(6.38 \times 10^{-10})\,\Delta T}{\lambda - 0.204}\right]
\Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 4.29 |
|---|---|
| Relative Cost | 1.4 |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 2 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 52 |
| Alkali Resistance | — |
| Phosphate Resistance | 2 |
Notes
Low Softening Temperature
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| D-LAF050-25 | CDGM | 1.76709 | 49.197491 | |
| M-TAF101 | Hoya | 1.76802 | 49.24 | |
| D-LAF050 | CDGM | 1.76842 | 49.28216 | |
| K-LaFK50T(M) | Sumita | 1.76209 | 49.6 | |
| MC-TAF101-100 | Hoya | 1.76902 | 49.29 | |
| MP-TAF101-100 | Hoya | 1.76902 | 49.29 | |
| K-LaFK50T | Sumita | 1.766 | 49.8 | |
| K-LaFK50(M) | Sumita | 1.76831 | 49.7 | |
| MC-TAF115 | Hoya | 1.77047 | 49.46 | |
| K-LaFK50L | Sumita | 1.7682 | 50.0 |
Similar Glasses (Ohara)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| S-LAH96 | Ohara | 1.76385 | 48.488692 | |
| S-LAH66 | Ohara | 1.772499 | 49.598371 | |
| LAH66 | Ohara | 1.772499 | 49.60134 | |
| S-LAM54 | Ohara | 1.756998 | 47.82317 | |
| LAM54 | Ohara | 1.756998 | 47.815604 | |
| L-LAH87 | Ohara | 1.7703 | 47.401904 | |
| L-LAM60 | Ohara | 1.743198 | 49.295578 | |
| LAM60 | Ohara | 1.743198 | 49.309053 | |
| S-LAM60 | Ohara | 1.743198 | 49.339444 | |
| S-YGH52 | Ohara | 1.7865 | 50.001717 |