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## Optical constants of OHARA - FTM

S-FTM16

Wavelength:
µm

(0.35 – 2.4)

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

n
k
LogX
LogY
eV

### Derived optical constants

### Dispersion formula

$$n^2-1=\frac{1.32940907λ^2}{λ^2-0.0102377287}+\frac{0.141512125λ^2}{λ^2-0.0578081956}+\frac{1.44299068λ^2}{λ^2-150.597139}$$### Conditions & Spec sheet

n_absolute: false wavelength_vacuum: false temperature: 25.0 °C thermal_dispersion: - type: "Schott formula" coefficients: -5.29e-06 1.4e-08 -4.19e-11 6.9e-07 8.13e-10 0.287 nd: 1.592701 Vd: 35.310075 glass_code: 593353 density: 2.64 g/cm^{3}thermal_expansion: - temperature_range: -30 70 °C coefficient: 9e-06 K^{-1}- temperature_range: 20 300 °C coefficient: 1e-05 K^{-1}dPgF: 0.009 climatic_resistance: 1.0 acid_resistance: 1.0 phosphate_resistance: 2.0

### Comments

Recommended

### References

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

See also OHARA glass data sheets