BSM4 by Ohara

Obsolete Unknown Environmentally Dangerous
Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.365–0.9 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.365–0.9 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.360–0.700 µm
Optical Properties
Refractive Index (nd) 1.612716
Abbe Number (Vd) 58.749129
Dispersion Formula Schott
Wavelength Range 0.365 — 0.9 µm
$$n(\lambda) = \sqrt{2.55969 - 0.0101446\,\lambda^2 + 0.0142618\,\lambda^{-2} + 0.00047532\,\lambda^{-4} - 3.12877 \times 10^{-5}\,\lambda^{-6} + 1.73599 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.6
TCE 100/300°C (10-6/K) 7.6
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[4.8681 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.55
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance —
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd
N-SK4 Schott 1.61272 58.63
SK4 Schott 1.61272 58.629829
SK4 Sumita 1.61272 58.6
K-SK4 Sumita 1.61272 58.6
BACD4 Hoya 1.61272 58.58
H-ZK6 CDGM 1.61272 58.577083
C13-58 Corning 1.612693 58.570371
K-PSK200 Sumita 1.61305 59.0
K-PSK200(M) Sumita 1.61083 58.9
H-ZK4 CDGM 1.60881 58.855991
Similar Glasses (Ohara)
Glass Manufacturer nd Vd
S-BSM4 Ohara 1.612716 58.716945
BSM7 Ohara 1.607291 59.375631
S-BSM15 Ohara 1.622992 58.165763
BSM15 Ohara 1.622992 58.143312
BSM16C Ohara 1.62041 60.254106
BSM16 Ohara 1.62041 60.271913
S-BSM16 Ohara 1.620411 60.289582
S-BSM2 Ohara 1.607379 56.816076
BSM2 Ohara 1.607379 56.815789
BSM10 Ohara 1.622799 57.063643
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