Sellmeier curve fitting
Input parameters
Fitting data0 pts
Bulk paste
Fitting formula: n² = A + B / (λ² - C) − D · λ²
Note: input wavelengths are in nm; fitting uses μm internally. Results show the full formula with λ in μm.
Formula
Sellmeier
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. Four-parameter Sellmeier fit needs at least 4 wavelength/index data points per group.
2. With exactly 4 points, A/B/C/D are fully determined; with more points, least-squares fitting is used.
3. Abbe number defaults: F = 486.1327 nm, d = 587.5618 nm, C = 656.2725 nm.
4. Hover for crosshair; left-click to select a curve; scroll to zoom; right-click to reset view.