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## Optical constants of OHARA - PHM (Phosphate, medium-index)

S-PHM52

Wavelength:
µm

(0.33 – 2.4)

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

n
k
LogX
LogY
eV

### Derived optical constants

### Dispersion formula

$$n^2-1=\frac{1.0996655λ^2}{λ^2-0.0132718559}+\frac{0.478125422λ^2}{λ^2+0.000601649685}+\frac{1.13214074λ^2}{λ^2-130.595472}$$### Conditions & Spec sheet

n_absolute: false wavelength_vacuum: false temperature: 25.0 °C thermal_dispersion: - type: "Schott formula" coefficients: -1.15e-05 5.4e-09 -3.69e-11 4.44e-07 9.12e-10 0.166 nd: 1.618000 Vd: 63.333504 glass_code: 618634 density: 3.67 g/cm^{3}thermal_expansion: - temperature_range: -30 70 °C coefficient: 1.01e-05 K^{-1}- temperature_range: 20 300 °C coefficient: 1.2e-05 K^{-1}dPgF: 0.0051 climatic_resistance: 2.0 acid_resistance: 5.0 phosphate_resistance: 4.0

### Comments

Recommended

### References

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

See also OHARA glass data sheets