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## Optical constants of OHARA - FPL (Fluorophosphate, low-index)

S-FPL55

Wavelength:
µm

(0.280 – 2.400)

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

n
k
LogX
LogY
eV

### Derived optical constants

### Dispersion formula

$$n^2-1=\frac{0.839067682λ^2}{λ^2-0.00795286639}+\frac{0.214083503λ^2}{λ^2+0.00232581717}+\frac{1.47914677λ^2}{λ^2-340.0437}$$### Conditions & Spec sheet

n_absolute: false wavelength_vacuum: false temperature: 25.0 °C thermal_dispersion: - type: "Schott formula" coefficients: -2.1e-05 -7.63e-09 1.24e-11 2.82e-07 1.8e-10 0.224 nd: 1.438750 Vd: 94.661059 density: 3.59 g/cm^{3}thermal_expansion: - temperature_range: -30 70 °C coefficient: 1.36e-05 K^{-1}dPgF: 0.0457 climatic_resistance: 2.0 acid_resistance: 52.1 phosphate_resistance: 4.1

### Comments

Recommended -The unique relative partial dispersion.

### References

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

See also OHARA glass data sheets