BSM51Y by Ohara
Standard
Unknown
i-line
Environmentally Dangerous
BSM51Y by Ohara is a standard optical glass. It transmits from 0.29 to 2.40 µm with an nd of 1.603109 and a Vd of 60.651225. It has low thermal expansion (CTE of 6.4×10⁻⁶/K), below 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
| Refractive Index (nd) | 1.603109 |
|---|---|
| Abbe Number (Vd) | 60.651225 |
| Dispersion Formula | Sellmeier |
| Wavelength Range | 0.326106 — 2.32542 µm |
$$n(\lambda) = \sqrt{1 + \frac{1.22393\,\lambda^2}{\lambda^2 - 0.00649521} + \frac{0.306482\,\lambda^2}{\lambda^2 - 0.0208194} + \frac{0.823951\,\lambda^2}{\lambda^2 - 79.5169}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 6.4 |
|---|---|
| TCE 100/300°C (10-6/K) | 7.7 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[2.03 \times 10^{-6} + 2(1.19 \times 10^{-8})\,\Delta T + 3(-4.08 \times 10^{-11})\,\Delta T^2 + \frac{4.45 \times 10^{-7} + 2(5.05 \times 10^{-10})\,\Delta T}{\lambda - 0.166}\right]
\Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Chemical Resistance
| Climatic Resistance | 3 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 51 |
| Alkali Resistance | — |
| Phosphate Resistance | 2 |
Notes
Improved XMT at 365
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| H-ZK14 | CDGM | 1.60311 | 60.603787 | |
| K-SK14 | Sumita | 1.60311 | 60.7 | |
| BACD14 | Hoya | 1.60311 | 60.7 | |
| SK14 | Sumita | 1.60311 | 60.7 | |
| N-SK14 | Schott | 1.60311 | 60.6 | |
| SK14 | Schott | 1.60311 | 60.596819 | |
| FCD600 | Hoya | 1.5941 | 60.47 | |
| SK7 | Sumita | 1.60729 | 59.5 | |
| K-SK7 | Sumita | 1.60729 | 59.5 | |
| BACD7 | Hoya | 1.607292 | 59.474776 |
Similar Glasses (Ohara)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| S-BSM14 | Ohara | 1.603112 | 60.64108 | |
| BSM14 | Ohara | 1.603112 | 60.704896 | |
| BSM7 | Ohara | 1.607291 | 59.375631 | |
| L-BAL35P | Ohara | 1.59208 | 60.993997 | |
| S-BAL35R | Ohara | 1.58913 | 60.960312 | |
| S-BAL35 | Ohara | 1.58913 | 61.135024 | |
| L-BAL35 | Ohara | 1.58913 | 61.152601 | |
| BAL35 | Ohara | 1.58913 | 61.182174 | |
| BAL35Y | Ohara | 1.58913 | 61.233033 | |
| BSM4 | Ohara | 1.612716 | 58.749129 |