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## Optical constants of OHARA - BSM (Borosilicate, medium-index)

S-BSM25

Wavelength:
µm

(0.33 – 2.4)

### Complex refractive index (*n+ik)*

n
k
LogX
LogY
eV

### Derived optical constants

### Dispersion formula

$$n^2-1=\frac{1.34814257λ^2}{λ^2-0.00695364366}+\frac{0.347530319λ^2}{λ^2-0.0277863478}+\frac{1.38798368λ^2}{λ^2-142.138122}$$### Conditions & Spec sheet

n_absolute: false wavelength_vacuum: false temperature: 25.0 °C thermal_dispersion: - type: "Schott formula" coefficients: 3.67e-06 1.31e-08 -3.66e-11 4.35e-07 3.4e-10 0.271 nd: 1.658441 Vd: 50.877554 glass_code: 658509 density: 3.5 g/cm^{3}thermal_expansion: - temperature_range: -30 70 °C coefficient: 6.8e-06 K^{-1}- temperature_range: 20 300 °C coefficient: 8.2e-06 K^{-1}dPgF: -0.0031 climatic_resistance: 2.0 acid_resistance: 5.2 phosphate_resistance: 1.0

### Comments

Recommended

### References

OHARA Zemax catalog 2017-11-30 (obtained from http://www.ohara-inc.co.jp)

See also OHARA glass data sheets