S-NPH3 by Ohara
Standard
Very Common
Environmentally Friendly
S-NPH3 by Ohara is a standard optical glass with a very common melt frequency. It transmits from 0.40 to 2.40 µm with an nd of 1.95906 and a Vd of 17.471252. It has low thermal expansion (CTE of 5.9×10⁻⁶/K), excellent chemical resistance, and moderate relative cost.
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) | 1.95906 |
|---|---|
| Abbe Number (Vd) | 17.471252 |
| Dispersion Formula | Sellmeier |
| Wavelength Range | 0.404656 — 2.32542 µm |
$$n(\lambda) = \sqrt{1 + \frac{2.09835\,\lambda^2}{\lambda^2 - 0.0179124} + \frac{0.489088\,\lambda^2}{\lambda^2 - 0.0776653} + \frac{2.94009\,\lambda^2}{\lambda^2 - 160.93}}$$
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) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-1.98 \times 10^{-6} + 2(1.36 \times 10^{-8})\,\Delta T + 3(-3.16 \times 10^{-11})\,\Delta T^2 + \frac{1.15 \times 10^{-6} + 2(1.85 \times 10^{-9})\,\Delta T}{\lambda - 0.34}\right]
\Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 1 |
| Alkali Resistance | — |
| Phosphate Resistance | 1 |
Notes
Recommended
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| H-ZF73GT | CDGM | 1.95906 | 17.472434 | |
| H-ZF73 | CDGM | 1.95906 | 17.472434 | |
| H-ZF88 | CDGM | 1.94595 | 17.941964 | |
| H-ZF88GT | CDGM | 1.94595 | 17.941964 | |
| FDS18-W | Hoya | 1.94595 | 17.98 | |
| FDS18 | Hoya | 1.94595 | 17.98 | |
| SF59 | Schott | 1.952497 | 20.363706 | |
| FDS165-W | Hoya | 1.98611 | 17.25 | |
| FDS16-W | Hoya | 1.98612 | 16.48 | |
| H-ZF72A | CDGM | 1.92286 | 18.895887 |
Similar Glasses (Ohara)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| S-NPH2 | Ohara | 1.92286 | 18.896912 | |
| PBH21 | Ohara | 1.922861 | 20.884172 | |
| PBH71 | Ohara | 1.922864 | 21.288699 | |
| S-TIH57 | Ohara | 1.963 | 24.1144 | |
| PBH72 | Ohara | 1.915356 | 21.171926 | |
| S-NPH4 | Ohara | 1.89286 | 20.36181 | |
| L-NBH54 | Ohara | 1.902 | 25.101413 | |
| S-LAH79 | Ohara | 2.0033 | 28.27328 | |
| S-LAH99W | Ohara | 2.001 | 29.139473 | |
| S-LAH99 | Ohara | 2.001 | 29.139473 |