Diffraction Grating Resolving Power & Dispersion Calculator

Determine diffraction grating resolving power ($R = \lambda / \Delta\lambda$), angular dispersion ($d\beta/d\lambda$), diffraction angle ($\beta$), and Rayleigh resolution limit.

Grating Specifications & Optical Setup

Groove Density N (grooves/mm): Typical: 600, 1200, 1800, 2400

Illuminated Width W (mm): Aperture width of ruled area

Center Wavelength λ (nm):

Diffraction Order (m):

Incidence Angle α (degrees): Measured from normal

Spectrograph Focal Length f (mm): For linear dispersion

Spectral Resolution & Diffraction Angles

Theoretical Resolving Power (R)

Min Resolvable Δλ

Rayleigh Criterion at λ

Diffraction Angle β

Angular Dispersion

Linear Dispersion (Recip)

Grating Period & Wavelength Limit

Grating Pitch d: -- µm | Littrow Condition: --°

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Diffraction Grating Resolving Power & Dispersion Calculator

Grating Specifications & Optical Setup

Spectral Resolution & Diffraction Angles

Frequently Asked Questions