This calculator estimates the transverse diffracted footprint on the two gratings in a dual-grating pulse compressor, using:

D1 = D₀ / cos(θᵢ) + 2A

D2 = D₀ / cos(θᵢ) + L · (tan(θd,max) − tan(θd,min)) + 2A

where D₀ is the incident beam diameter, θᵢ is the incidence angle, d is the groove density, L is the normal (perpendicular) grating separation, A is the edge margin, and λmin/λmax are the shortest/longest wavelengths of the incident spectrum.

Grating Aperture Size Calculator

Incident beam diameter, D₀ (mm):

Incidence angle, θᵢ (deg):

Groove density, d (lines/mm):

Grating separation (normal distance), L (mm):

Minimum wavelength, λmin (nm):

Maximum wavelength, λmax (nm):

Edge margin, A (mm):