Grating Diffraction Calculator
Calculate diffraction angles, angular dispersion, resolving power, and free spectral range for diffraction gratings using the grating equation.
Grating Parameters
Advanced Options
Primary Results
Groove Spacing (d)
Groove Spacing (d)
Diffraction Angle (β, m=1)
Dispersion
Angular Dispersion
Angular Dispersion
Littrow & Free Spectral Range
Littrow Angle (θ_L, m=1)
Free Spectral Range
All Propagating Orders
| Order (m) | Angle β (°) |
|---|---|
| -2 | -49.41 |
| -1 | -22.31 |
| 0 | 0 |
| +1 | 22.31 |
| +2 | 49.41 |
Abridged Optics — Grating Diffraction Calculator v1.0Calculations assume ideal grating behavior. Actual efficiency depends on groove profile, polarization, and coating.