L-LAH90 by Ohara
Standard
Very Rare
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) | 1.8322 |
|---|---|
| Abbe Number (Vd) | 40.097595 |
| Dispersion Formula | Sellmeier |
| Wavelength Range | 0.404656 — 2.32542 µm |
$$n(\lambda) = \sqrt{1 + \frac{1.97595\,\lambda^2}{\lambda^2 - 0.0104276} + \frac{0.283925\,\lambda^2}{\lambda^2 - 0.0427708} + \frac{1.35176\,\lambda^2}{\lambda^2 - 101.454}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 6.2 |
|---|---|
| TCE 100/300°C (10-6/K) | — |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[5.28 \times 10^{-6} + 2(1.08 \times 10^{-8})\,\Delta T + 3(3.8 \times 10^{-14})\,\Delta T^2 + \frac{8.31 \times 10^{-7} + 2(7.62 \times 10^{-10})\,\Delta T}{\lambda - 0.217}\right]
\Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 4.65 |
|---|---|
| Relative Cost | 2.0 |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 2 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 5 |
| Alkali Resistance | — |
| Phosphate Resistance | 1 |
Notes
Low Softening Temperature
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| D-ZLAF85LN-25 | CDGM | 1.84443 | 40.067973 | |
| D-ZLAF85LN | CDGM | 1.84558 | 40.094322 | |
| K-VC185(M) | Sumita | 1.84909 | 40.5 | |
| K-VC99(M) | Sumita | 1.84604 | 41.5 | |
| K-VC90(M) | Sumita | 1.84859 | 38.9 | |
| D-ZLAF85A-25 | CDGM | 1.8511 | 40.055609 | |
| MP-TAFD305 | Hoya | 1.85135 | 40.1 | |
| MC-TAFD305 | Hoya | 1.85135 | 40.1 | |
| M-TAFD305 | Hoya | 1.85135 | 40.1 | |
| MC-TAFD315 | Hoya | 1.85135 | 40.07 |
Similar Glasses (Ohara)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| S-LAH55 | Ohara | 1.834807 | 42.713673 | |
| LAH55 | Ohara | 1.834807 | 42.72372 | |
| S-LAH55V | Ohara | 1.834807 | 42.725324 | |
| S-LAH55VS | Ohara | 1.834809 | 42.74368 | |
| S-LAH89 | Ohara | 1.8515 | 40.782269 | |
| L-LAH84P | Ohara | 1.81225 | 40.294279 | |
| S-LAH60V | Ohara | 1.833999 | 37.206855 | |
| S-LAH60MQ | Ohara | 1.833999 | 37.172099 | |
| LAH60 | Ohara | 1.834 | 37.166863 | |
| S-LAH60 | Ohara | 1.834 | 37.160487 |