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## Optical constants of OHARA - NBM (Niobate, medium-index)

S-NBM51

Wavelength:
µm

(0.32 – 2.4)

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

n
k
LogX
LogY
eV

### Derived optical constants

### Dispersion formula

$$n^2-1=\frac{1.37023101λ^2}{λ^2-0.00871920342}+\frac{0.177665568λ^2}{λ^2-0.0405725552}+\frac{1.30515471λ^2}{λ^2-112.703058}$$### Conditions & Spec sheet

n_absolute: false wavelength_vacuum: false temperature: 25.0 °C thermal_dispersion: - type: "Schott formula" coefficients: 3.21e-06 1.49e-08 -3.78e-11 5.35e-07 6.88e-10 0.25 nd: 1.613397 Vd: 44.267706 glass_code: 613443 density: 2.93 g/cm^{3}thermal_expansion: - temperature_range: -30 70 °C coefficient: 6.5e-06 K^{-1}- temperature_range: 20 300 °C coefficient: 7.8e-06 K^{-1}dPgF: -0.0065 climatic_resistance: 2.0 acid_resistance: 1.0 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