Cauchy Fit
Input parameters
Fitting data0 pts
Bulk paste
Fitting formula: n = A + B / λ² + C / λ⁴
Note: input is in nm; values are converted to μm internally for stable fitting. Full formula is shown in results.
Formula
Cauchy
Current λ (nm)
0.000
Current n
0.00000
Selected curve
None
Fitting results
Scroll to zoom | Drag to select | Right-click reset | Follow curve
Index calculator
Click Calculate to show index n for each group.
Tips
1. Cauchy fitting needs at least 3 wavelength / index data points.
2. With exactly three points the curve passes through them (R² ≈ 1); more points use least squares.
3. Abbe number uses F=486.1327 nm, d=587.5618 nm, C=656.2725 nm by default.
4. Move the mouse for crosshairs; left-click to select a curve; scroll to zoom; right-click to reset view.