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## Optical constants of OHARA - TIL (Titanate, low-index)

S-TIL2

Wavelength:
µm

(0.34 – 2.4)

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

n
k
LogX
LogY
eV

### Derived optical constants

### Dispersion formula

$$n^2-1=\frac{1.23401499λ^2}{λ^2-0.00869507801}+\frac{0.0959796833λ^2}{λ^2-0.0465611429}+\frac{1.20503991λ^2}{λ^2-137.953301}$$### Conditions & Spec sheet

n_absolute: false wavelength_vacuum: false temperature: 25.0 °C thermal_dispersion: - type: "Schott formula" coefficients: -4e-07 1.28e-08 -4.06e-11 5.09e-07 5.15e-10 0.272 nd: 1.540720 Vd: 47.227127 glass_code: 541472 density: 2.52 g/cm^{3}thermal_expansion: - temperature_range: -30 70 °C coefficient: 8.2e-06 K^{-1}- temperature_range: 20 300 °C coefficient: 9.8e-06 K^{-1}climatic_resistance: 2.0 acid_resistance: 1.0 phosphate_resistance: 1.0

### Comments

Recommended - Lightweight

### References

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

See also OHARA glass data sheets