Cauchy Equation calculator
Visible-range index approximation n(λ) = A + B/λ² + C/λ⁴.
Category: Materials
Formula: n = A + B/λ² + C/λ⁴
Inputs
| Input | Parameter | Unit | Default |
|---|---|---|---|
| Wavelength | lam | µm | 0.589 |
| A | A | 1.5046 | |
| B (µm²) | B | 0.0042 | |
| C (µm⁴) | C | 0 |
Result with the default inputs
- n(λ): 1.516707
Open it with your own values: put each input in the address as a parameter, for example /calculators/cauchy-equation?lam=0.589. A unit other than the listed one goes in <parameter>_unit.
Read more: Wikipedia: Cauchy's equation