BSM7 by Ohara

Obsolete Unknown Environmentally Dangerous
Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.3–2.4 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.3–2.4 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.300–0.700 µm
Optical Properties
Refractive Index (nd) 1.607291
Abbe Number (Vd) 59.375631
Dispersion Formula Schott
Wavelength Range 0.3 — 2.4 µm
$$n(\lambda) = \sqrt{2.54321 - 0.0102068\,\lambda^2 + 0.0139832\,\lambda^{-2} + 0.000459632\,\lambda^{-4} - 3.29632 \times 10^{-5}\,\lambda^{-6} + 1.94134 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.5
TCE 100/300°C (10-6/K) 7.6
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[2.929 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.51
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance —
Stain Resistance —
Acid Resistance 51
Alkali Resistance —
Phosphate Resistance 2
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd
SK7 Schott 1.60729 59.459272
BACD7 Hoya 1.607292 59.474776
SK7 Sumita 1.60729 59.5
K-SK7 Sumita 1.60729 59.5
C09-59 Corning 1.608756 59.036803
SK3 Schott 1.60881 58.921505
SK3 Sumita 1.60881 58.9
BACD3 Hoya 1.608812 58.863994
H-ZK4 CDGM 1.60881 58.855991
K-PSK200(M) Sumita 1.61083 58.9
Similar Glasses (Ohara)
Glass Manufacturer nd Vd
BSM4 Ohara 1.612716 58.749129
S-BSM4 Ohara 1.612716 58.716945
S-BSM14 Ohara 1.603112 60.64108
BSM51Y Ohara 1.603109 60.651225
BSM14 Ohara 1.603112 60.704896
BSM16C Ohara 1.62041 60.254106
BSM16 Ohara 1.62041 60.271913
S-BSM16 Ohara 1.620411 60.289582
S-BSM15 Ohara 1.622992 58.165763
BSM15 Ohara 1.622992 58.143312
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