LAF7 by Hoya
Obsolete
Unknown
Environmentally Dangerous
LAF7 by Hoya is an obsolete optical glass. It transmits from 0.35 to 1.55 µm with an nd of 1.749497 and a Vd of 35.042695. It has medium thermal expansion (CTE of 7.2×10⁻⁶/K), good 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) | 7.2 |
|---|---|
| TCE 100/300°C (10-6/K) | 81.0 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[7.76614 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | 0 |
| Acid Resistance | 3 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| LAF70 | Sumita | 1.7495 | 35.0 | |
| H-LAF4 | CDGM | 1.7495 | 34.989266 | |
| H-LAF4GT | CDGM | 1.7495 | 34.989266 | |
| LAFN7 | Schott | 1.7495 | 34.95 | |
| N-LAF7 | Schott | 1.7495 | 34.82 | |
| LAM7 | Ohara | 1.749497 | 35.278026 | |
| S-LAM7 | Ohara | 1.749497 | 35.283397 | |
| S-NBH51 | Ohara | 1.749504 | 35.33248 | |
| S-NBH59 | Ohara | 1.766342 | 35.82343 | |
| H-LAFL5 | CDGM | 1.75367 | 37.491665 |
Similar Glasses (Hoya)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| E-LAF7 | Hoya | 1.7495 | 35.04 | |
| NBFD6 | Hoya | 1.756702 | 36.345258 | |
| NBFD9 | Hoya | 1.756898 | 31.798532 | |
| ADF505 | Hoya | 1.739996 | 31.655919 | |
| NBFD32 | Hoya | 1.73037 | 32.23 | |
| ADF455 | Hoya | 1.71852 | 33.456548 | |
| BAFD8 | Hoya | 1.72342 | 37.99 | |
| NBFD7 | Hoya | 1.782999 | 36.06621 | |
| NBFD5 | Hoya | 1.762001 | 40.263213 | |
| NBFD29 | Hoya | 1.77047 | 29.74 |