LAC9 by Hoya
Special
Very Rare
Environmentally Dangerous
LAC9 by Hoya is a special optical glass with a very rare melt frequency. It transmits from 0.28 to 1.55 µm with an nd of 1.691 and a Vd of 54.7. It has low thermal expansion (CTE of 5.8×10⁻⁶/K), average chemical resistance, and dangerous environmental properties.
Refractive Index vs Wavelength
Refractive Index Calculator
dn/dλ vs Wavelength
dn/dλ Calculator
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Optical Properties
Thermal Properties
| TCE -30/70°C (10-6/K) | 5.8 |
|---|---|
| TCE 100/300°C (10-6/K) | 7.3 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[6.88596 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 5 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Notes
Not in a position to accept new order because of discontinuation.
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| LAK9 | Schott | 1.691002 | 54.708408 | |
| N-LAK9 | Schott | 1.691 | 54.71 | |
| LAK9G15 | Schott | 1.69064 | 54.76 | |
| C90-55 | Corning | 1.691008 | 54.793839 | |
| K-LaK9 | Sumita | 1.691 | 54.8 | |
| LAK9 | Sumita | 1.691 | 54.8 | |
| H-LAK59A | CDGM | 1.691 | 54.815309 | |
| S-LAL9 | Ohara | 1.691002 | 54.822578 | |
| LAL9 | Ohara | 1.691002 | 54.84322 | |
| H-LAK2A | CDGM | 1.69211 | 54.539198 |